Snap-action switch S970 – Compact microswitch for safety applications in aggressive environments

Changeover contact with self-cleaning contacts and positive opening. Resistant PEI housing against extreme temperatures and aggressive chemicals.

S970 W3L1 a
Snap-action switch S970 with pushbutton and assembled cable
S970 W3B1 a
Snap-action switch S970 with pushbutton and strand connection

The S970 snap-action switch is identical in design to the S870, but has a polyetherimide (PEI) housing. This microswitch can therefore be used in a temperature range from –55° to +150° Celsius. It is resistant to aggressive chemicals and sealed against powder dust. The housing of the S970 is fifty per cent more shock-resistant than the polycarbonate housing of the S870.


Changeover contact, break contact or make contact

The standard design is a changeover contact with three connections. The switch is also available as break contact or make contact (with two connections).

Break contact with positive opening

If the break contacts fuse in the event of a short circuit, the catch spring can no longer open. It is nevertheless opened reliably via the lever of the positive opening. This is a positive opening as outlined in DIN EN 60947-5-1, annex K.

Self-cleaning contacts

The moving contact rubs against the fixed contact during every actuation. This removes corrosion and combustion residue and reduces contact resistance.

Shock resistance 70 g, vibration resistance 50 g

The switch mechanism of this microswitch has been designed to be especially robust. Catch springs and return springs are designed so that the switching process works reliably even in the event of shocks and vibrations.

Protection class up to IP67 (contact area and connections)

Contact area IP40 Connections IP00 // Screws M3, flat screw 6.3 × 0.8

Contact area IP60 Connections IP00 // Screws M3, flat screw 6.3 × 0.8

Contact area IP67 Connections IP00 // Screws M3, flat screw 6.3 × 0.8

Contact area IP67 Connections IP67 // Stranded wire, lateral, length 500 mm

PEI housing – Resistant against extreme temperatures and chemicals

Housing material: PEI, amber-transparent / PEI, black
Temperature range: –55°C to +150°C max.; depending on the design

Dimensions 30 x 16 x 10.5 mm (L x H x W)

This is the maximum dimensions of the housing. The dimensions of the actuator and of the connections must be added. For all dimensions and drawings please refer to the following product catalogue:


By selecting this option you finish the configuration.



Electrical Data
Contact configurationSPDT (Form C) snap-action switch with 3 terminals, positive opening operation, and wiping action
Conv. thermal current Ith EN6094710 A at T = 85°C
Conv. thermal current Ith UL50810 A at T = 85°C
Rated insulation voltage Ui EN60947250 V
Rated insulation voltage Ui UL508240 V
Pollution degree IEC 60947PD 3
Pollution degree UL508PD 2
Rated impulse withstand voltage Uimp4 kV
Utilization category IEC 60947AC-15, 230 VAC/1.5 A / DC-13, 60 VDC/0.5 A
Utilization category UL508240 V AC/1.5 A / DC 60 VDC/0.5 A (General Purpose)
IP rating: contacts/terminalsIP40/IP00, IP40/IP20, IP60/00, IP67/00
Contact materialSilver or gold
Short-circuit protection10 A gG
Actuators, operating positions
ActuatorPush button, roller lever, plain lever, simulated roller lever
Free position16.0 ±0.1 (push button)
Operating position14.8 ±0.2 (push button)
Release position15.1 ±0.2 (push button)
Total positive opening travel13.3 (push button)
Total travel position< 13.0 (push button)
Movement differential (between operating and release position)0.3 (typical, push button)
Mechanical data
Front mount---
Ganging (side mount)yes, side mount
Actuation speedmax. 1.0 m/s, min. 0.1 mm/s
Vibration resistance50 g (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time)
Shock resistance70 g, half sinus (without aux. actuator at 0.1 ms max. opening time)
Housing materialPEI, amber transparent / PEI, black
Mechanical endurance10 million cycles min., dependent on version
Temperature range-55 °C ... +150 °C max., dependent on version
NoteData valid for switches with silver contacts. Data valid for new switches under laboratory conditions and at room temperature, unless otherwise mentioned.

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Snap-action switches
Snap-action switch S970