WIKA · Level measurement · Family MSA
Magnetic switch
Magnetic switches for position sensing and automation, featuring reed contacts actuated by permanent magnets, suitable for extreme environments.
Output
dry contact · reed contact
Accuracy
0.01 mm
Protection
IP65
Price
On request
Depends on configuration
Description
The magnetic switch is made up of flat contact studs, which are hermetically sealed in a glass tube filled with inert gas (reed contact). By bringing a permanent magnet close, the overlapping contact stud ends attract each other and spring together into contact. Upon removal of the permanent magnet, the contact studs demagnetise immediately and return to their rest position.
The air gap between the contact stud ends is only 0.2 ... 0.3 mm and, for the contact studs, the mass to be moved and their spring force are very small. Thus the magnetic switch switches with almost no inertia and one can consider it as a 'quasi-electronic component'.
Fig. centre: MSA-GMSM 16 Fig. right: MSA-KRS 9
These cost-effective magnetic switches, which are particularly easy to install, are excellently suited for the automation of processes and as position indicators for sliders, flaps and valves.
The reliability of these compact switches is ensured through their long electrical service life. Since the magnetic switches mostly consist of just one component, they are particularly safe in operation.
Special features
- Magnetic switches work properly under extreme environmental influences, e.g. dirt, humidity, gases, dust, chips etc.
- Stable switch point, reproducible switch point accuracy 0.01 mm
- Reed contact can be actuated from several directions
- Can be mounted in any orientation
- Can be actuated in a voltage-free condition, bistable variants can save signals and are particularly suitable for extremely long stroke lengths
Identification
| Product family | MSA |
| Subcategory | Magnetic switch |
Process conditions
| Process connection | M10 x 1 threadM12 x 1 threadM18 x 1.5 threadno thread (cylindrical body) |
| Process temperature | −10…+80 °C |
| Measurement technology | magnetic_switch |
Electrical characteristics
| Output signal | dry contact · reed contact · normally_open · normally_closed · change-over · bistable |
| Electrical connection | cable or connector (model dependent) |
Materials
| Wetted parts material | brass, stainless steel, polyamide (glass-fibre reinforced), stainless_steel, polyamide, aluminium |
Operating environment
| Ambient temperature | −10…+80 °C |
| IP rating | IP65 |
Additional details
| Datasheet languages | EN, DE |
Tables from datasheet
| Magnetic switches, case forms and materials | Dimensions | Switch | Max. switching power AC/DC | Max. switching | Max.switching |
|---|---|---|---|---|---|
| behaviour voltage current AC/DC Mini magnetic switch in round stainless steel case | |||||
| Model MSA-VS-Lx | L = 40 or 55 | Monostable | 10VA/5W | 230V | 0.5 A / 0.25 A |
| Magnetic switch in round polyamide case, glass-fibre reinforced | |||||
| Model MSA-MRS 9 | L = 50 | Monostable | 10VA/5W | 230V | 0.5 A / 0.25 A |
| Model MSA-KRS 9 | L = 60 | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-KRU 9 | L = 60 | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-KWU 9 | L = 60 | Monostable | 50VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-GMS 9 | L = 80 | Monostable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-GMU 9 | L = 80 | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-GMSM 16 | L = 75 | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-GMOM 16 | L = 75 | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-GMUM 16 | L = 75 | Bistable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Magnetic switch in round brass case | |||||
| Model MSA-MRS 10 | M10 x 1 thread | Monostable | 10VA/5W | 230V | 0.5 A / 0.25 A |
| Model MSA-MRS 12 | M12 x 1 thread | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-MRU 12 | M12 x 1 thread | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-MRS 20 | M20 x 1 thread | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-MRU 20 | M20 x 1 thread | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Magnetic switch in round polyamide case | |||||
| Model MSA-GMS 18 | M18 x 1.5 thread | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-GMU 18 | M18 x 1.5 thread | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-GMUM 18 | M18 x 1.5 thread | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Magnetic switch in flat polyamide case, glass-fibre reinforced | |||||
| Model MSA-DRS | L = 80 | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-DRU | L = 80 | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-DRSM | L = 80 | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-DRUM | L = 80 | Bistable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-DWU | L = 80 | Monostable | 50VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-DGS | L = 80 | Monostable | 100VA /50W | 230V | 1 A / 0.5 A |
| Magnetic switch in aluminium case | |||||
| Model MSA-FKS-AL | L = 50 | Monostable | 10VA/5W | 230V | 0.5 A / 0.25 A |
| Model MSA-FKOM-AL | L = 50 | Bistable | 10VA/5W | 230V | 0.5 A / 0.25 A |
| Model MSA-FKSM-AL | L = 50 | Bistable | 10VA/5W | 230V | 0.5 A / 0.25 A |
| Model MSA-FLS-AL | L = 80 | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-FLU-AL | L = 80 | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-FLSM-AL | L = 80 | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-FLUM-AL | L = 80 | Bistable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-FWU-AL | L = 80 | Monostable | 50VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-FGMS-AL | L = 80 | Monostable | 100VA /50W | 230V | 1 A / 0.5 A |
| Magnetic switch in round stainless steel case | |||||
| Model MSA-EVS-L70 (KRS) | L = 70 | Monostable | 60VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-EVU-L70 (KRU) | L = 70 | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-EVS-L100 (GMS) | L = 100 | Monostable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-EVSM-L100 (GMSM) | L = 100 | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-EVOM-L1004 (GMOM) | L = 100 | Bistable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-EVUM-L100 (GMUM) | L = 100 | Bistable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Slot magnetic switch for non-contact actuation using a sheet iron flag in polyamide case | |||||
| Model MSA-SRO | - | Monostable | 100VA /50W | 230V | 1 A / 0.5 A |
| Model MSA-SRU | - | Monostable | 30VA /20W | 230V | 0.5 A / 0.35 A |
| Model MSA-SWO | - | Monostable | 50VA /30W | 230V | 1 A / 0.5 A |
| Model MSA-SWU | - | Monostable | 50VA /30W | 230V | 1 A / 0.5 A |
| Specifications | |
|---|---|
| Switching function | Normally open |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 10VA DC5W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 0.5 A DC 0.25 A |
| Switching frequency | 1,000 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP54 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Stainless steel |
| Specifications | |
|---|---|
| Switching function | Normally open |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 10VA DC5W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 0.5 A DC 0.25 A |
| Switching frequency | 1,000 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP54 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Stainless steel |
| Specifications | |
|---|---|
| Switching function | Normally open |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 10VA DC5W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 0.5 A DC 0.25 A |
| Switching frequency | 1,000 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Polyamide, glass-fibre reinforced |
View all (20)
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-KRS 9 | Normally open |
| Model MSA-KRU 9 | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-KRS 9 | AC 60VA DC30W |
| Model MSA-KRU 9 | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-KRS 9 | AC 1 A DC 0.5 A |
| Model MSA-KRU 9 | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-KRS 9 | 2-wire PVC |
| Model MSA-KRU 9 | 3-wire PVC |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 50VA DC30W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 1 A DC 0.5 A |
| Switching frequency | 100 1/sec |
| Switch hysteresis | approx. 2 ...3mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-GMS 9 | Normally open |
| Model MSA-GMU 9 | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-GMS 9 | AC 100VA DC50W |
| Model MSA-GMU 9 | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-GMS 9 | AC 1 A DC 0.5 A |
| Model MSA-GMU 9 | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | |
| Model MSA-GMS 9 | approx. 3 ...4mm |
| Model MSA-GMU 9 | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-GMS 9 | 2-wire PVC |
| Model MSA-GMU 9 | 3-wire PVC |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-GMSM 16 | Normally open |
| Model MSA-GMOM 16 | Normally closed |
| Model MSA-GMUM 16 | Change-over |
| Switch behaviour | Bistable |
| Contact material | Rhodium |
| Switching power | |
| Models MSA-GMSM 16 and MSA-GMOM16 | AC 100VA DC50W |
| Model MSA-GMUM 16 | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Models MSA-GMSM 16 and MSA-GMOM16 | AC 1 A DC 0.5 A |
| Model MSA-GMUM 16 | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-GMSM 16 | 2-wire PVC |
| Model MSA-GMOM 16 | 2-wire PVC |
| Model MSA-GMUM 16 | 3-wire PVC |
| Case | Polyamide, glass-fibre reinforced |
Specifications
| Switching function | Normally open |
|---|---|
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 10VA DC5W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 0.5 A DC 0.25 A |
| Switching frequency | 1,000 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP54 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Brass |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-MRS 12 | Normally open |
| Model MSA-MRU 12 | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-MRS 12 | AC 60VA DC30W |
| Model MSA-MRU 12 | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-MRS 12 | AC 1 A DC 0.5 A |
| Model MSA-MRU 12 | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP54 |
| Connection cable | (specify length when ordering) |
| Model MSA-MRS 12 | 2-wire PVC |
| Model MSA-MRU 12 | 3-wire PVC |
| Case | Brass |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-MRS 20 | Normally open |
| Model MSA-MRU 20 | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-MRS 20 | AC 60VA DC30W |
| Model MSA-MRU 20 | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-MRS 20 | AC 1 A DC 0.5 A |
| Model MSA-MRU 20 | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | |
| Model MSA-MRS 20 | approx. 3 ...4mm |
| Model MSA-MRU 20 | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-MRS 20 | 2-wire PVC |
| Model MSA-MRU 20 | 3-wire PVC |
| Case | Brass |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-GMS 18 | Normally open |
| Model MSA-GMU 18 | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-GMS 18 | AC 60VA DC30W |
| Model MSA-GMU 18 | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-GMS 18 | AC 1 A DC 0.5 A |
| Model MSA-GMU 18 | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-GMS 18 | 2-wire PVC |
| Model MSA-GMU 18 | 3-wire PVC |
| Case | Polyamide |
| Specifications | |
|---|---|
| Switching function | Change-over |
| Switch behaviour | Bistable |
| Contact material | Rhodium |
| Switching power | AC 40VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 1 A DC 0.5 A |
| Switching frequency | 300 1/sec |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | 3-wire PVC (specify length when ordering) |
| Case | Polyamide |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-DRS | Normally open |
| Model MSA-DRU | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-DRS | AC 60VA DC30W |
| Model MSA-DRU | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-DRS | AC 1 A DC 0.5 A |
| Model MSA-DRU | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-DRS | 2-wire PVC |
| Model MSA-DRU | 3-wire PVC |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-DRSM | Normally open |
| Model MSA-DRUM | Change-over |
| Switch behaviour | Bistable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-DRSM | AC 100VA DC50W |
| Model MSA-DRUM | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-DRSM | AC 1 A DC 0.5 A |
| Model MSA-DRUM | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-DRSM | 2-wire PVC |
| Model MSA-DRUM | 3-wire PVC |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | Change-over |
| Switch behaviour | Monostable |
| Contact material | Tungsten |
| Switching power | AC 50VA DC30W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 1 A DC 0.5 A |
| Switching frequency | 100 1/sec |
| Switch hysteresis | approx. 2 ...3mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | 3-wire PVC (specify length when ordering) |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | Normally open |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 100VA DC50W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 1 A DC 0.5 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | approx. 3 ...4mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Polyamide, glass-fibre reinforced |
| Specifications | |
|---|---|
| Switching function | Normally open |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | AC 10VA DC5W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 0.5 A DC 0.25 A |
| Switching frequency | 1,000 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | 2-wire PVC (specify length when ordering) |
| Case | Aluminium |
Specifications
| Switching function | |
|---|---|
| Model MSA-FKSM-AL | Normally open |
| Model MSA-FKOM-AL | Normally closed |
| Switch behaviour | Bistable |
| Contact material | Rhodium |
| Switching power | AC 10VA DC5W |
| Switching voltage | AC/DC 230V |
| Switching current | AC 0.5 A DC 0.25 A |
| Switching frequency | 1,000 1/sec |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-FKSM-AL | 2-wire PVC |
| Model MSA-FKOM-AL | 2-wire PVC |
| Case | Aluminium |
| Specifications | |
|---|---|
| Switching function | |
| Model MSA-FLS-AL | Normally open |
| Model MSA-FLU-AL | Change-over |
| Switch behaviour | Monostable |
| Contact material | Rhodium |
| Switching power | |
| Model MSA-FLS-AL | AC 60VA DC30W |
| Model MSA-FLU-AL | AC 30VA DC20W |
| Switching voltage | AC/DC 230V |
| Switching current | |
| Model MSA-FLS-AL | AC 1 A DC 0.5 A |
| Model MSA-FLU-AL | AC 0.5 A DC 0.35 A |
| Switching frequency | 300 1/sec |
| Switch hysteresis | approx.5mm |
| Permissible temperature | -10 ...+80 °C |
| Ingress protection | IP65 |
| Connection cable | (specify length when ordering) |
| Model MSA-FLS-AL | 2-wire PVC |
| Model MSA-FLU-AL | 3-wire PVC |
| Case | Aluminium |
Industry
Machinery
Running and standstill monitoring for machinery · Control of machine tools and also textile and printing machinery
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