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 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.

Features

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:

(d70_en.pdf)

Specifications

Electrical Data

Contact configuration	SPDT (Form C) snap-action switch with 3 terminals, positive opening operation, and wiping action
Conv. thermal current I_th EN60947	10 A at T = 85°C
Conv. thermal current I_th UL508	10 A at T = 85°C
Rated insulation voltage U_i EN60947	250 V
Rated insulation voltage U_i UL508	300 V
Pollution degree IEC 60947	PD 3
Pollution degree UL508	PD 3
Rated impulse withstand voltage U_imp	4 kV
Utilization category IEC 60947	AC-15, 230 VAC/1.5 A / DC-13, 60 VDC/0.5 A
Utilization category UL508	240 V AC/1.5 A / DC 60 VDC/0.5 A (General Purpose)
IP rating: contacts/terminals	IP40/IP00, IP40/IP20, IP60/00, IP67/00
Contact material	Silver or gold
Short-circuit protection	10 A gG

Actuators, operating positions

Actuator	Push button, roller lever, plain lever, simulated roller lever
Free position	16.0 ±0.1 (push button)
Operating position	14.8 ±0.2 (push button)
Release position	15.1 ±0.2 (push button)
Total positive opening travel	13.3 (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 resistance	50 g (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time
Shock resistance	70 g, half sinus (without aux. actuator at 0.1 ms max. opening time)
Housing material	PC, green transparent / PC, black
Mechanical endurance	10 million cycles min.
Temperature range	-40 °C … +85 °C
Note	Data valid for switches with silver contacts. Data valid for new switches under laboratory conditions and at room temperature, unless otherwise mentioned.