Snap-action switch S870 – Compact microswitch for a wide variety of safety applications

Changeover contact with self-cleaning contacts and positive opening; protection class up to IP67.

S870 W1D1 m Snap-action switch S870 with flat lever and connections for flat plugs
S870 W1A1 a Snap-action switch S870 with pushbutton and screw connections
S870 W3L1 u Snap-action switch S870 with cam lever and assembled cable
S870 W3B1 t Snap-action switch S870 with roller lever and strand connection

The S870 snap-action switch offers high-quality switch technology in a compact design. This microswitch is designed as a changeover contact as standard. However, it can be supplied as a single break contact or make contact with two connections. The user can configure the optimal version of their S870 from a wide range of various actuators and connections.
The mechanical positive opening ensures the opening of the switch, even if the contacts have been fused by a short circuit. The self-cleaning contacts also connect small voltages and currents safely and reliably. With dust and water-proof designs up to IP67, the S870 is suitable for safety applications in tough industrial environments: for example, as an end position or position switch.


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.

Reliable switching of low currents

With self-cleaning silver contacts, small currents can be connected reliably and frequently. In chemically aggressive environments and with low switching frequencies, we recommend gold contacts.

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

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:



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 UL508300 V
Pollution degree IEC 60947PD 3
Pollution degree UL508PD 3
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
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 materialPC, green transparent / PC, black
Mechanical endurance10 million cycles min.
Temperature range-40 °C ... +85 °C
NoteData valid for switches with silver contacts. Data valid for new switches under laboratory conditions and at room temperature, unless otherwise mentioned.

Related Downloads

Catalogue D70 – Snap-action switches S870
Snap-action switches with positive opening operation and self-cleaning contacts
Safety instructions snap-action switches
Snap-action switches S800 / S804 / S814 / S818 / S819 / S820 / S826 / S834 / S840 / S845 / S846 / S847 / S850 / S870 / S880 / S926 / S947 / S970
Safety instructions snap-action switches / Supplementary details
Snap-action switches S800 / S804 / S814 / S818 / S819 / S820 / S826 / S834 / S840 / S845 / S846 / S847 / S850 / S870 / S880 / S926 / S947 / S970
Manual SE-M
Snap-action switches S800 / S804 / S814 / S818 / S819 / S820 / S826 / S840 / S845 / S846 / S847 / S850 / S870 / S880 / S926 / S947 / S970 — Installation and Maintenance Instructions
/en/products/snap-action-switches/thank-you/Snap-action switch S870 Snap-action switches

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