Schaltbau Snap-action switch S947

S947 Snap-action switch - Microswitch with PEI housing for extreme conditions, changeover contact with self-cleaning double contacts, galvanic isolation and positive opening, protection class up to IP67

S947 W2A2 a

Snap-action switch S947 with pushbutton and screw connections

The snap-action switch S947 is a version with an identical design to the S847 snap-action switch with a polyetherimide (PEI) housing. The dimensions, the switch mechanism and the electrical properties of both switches are identical.
Compared with the polycarbonate of the S847, PEI is considerably more resistant to extreme temperatures, aggressive chemicals and shocks. This microswitch is therefore recommended for safety applications under extreme ambient conditions.

Features

Robust against extreme temperatures, chemicals and shocks
Thanks to its polyetherimide (PEI) housing, this microswitch is robust against:

  • Extreme temperatures
  • Aggressive chemicals, and
  • Heavy impact forces (50% more shock-resistant than polycarbonate).
Break contacts 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.

Changeover contact with two galvanically isolated contact bridges.

Microswitches with two galvanically isolated contact bridges which are both attached in the plunger and are guided by it. When the snap-action switch is actuated, the bottom bridge opens the bottom contact pair (connections 1 and 2) and the top bridge closes the top contact pair (connections 3 and 4).

Self-cleaning double contacts

In every switching process, the contact bridges rub in a defined fashion on the V-shaped fixed contacts and remove corrosion and combustion residue. Permanently low contact resistances ensure a high level of contact reliability throughout the service life.

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

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.

Specifications

Electrical Data
Contact configuration SPDT-DB (Form Zb) snap-action switch with double-break contacts,
4 terminals, positive opening operation, wiping action, and 2 galvanically isolated contact bridges
Conv. thermal current Ith EN60947 10 A at T = 85°C
Conv. thermal current Ith UL508 10 A at T = 85°C
Rated insulation voltage Ui EN60947 400 V
Rated insulation voltage Ui UL508 300 V
Pollution degree IEC 60947 PD 3
Pollution degree UL508 PD 3
Rated impulse withstand voltage Uimp 4 kV
Utilization category IEC 60947 AC-15, 230 VAC/1.5 A / DC-13, 110 VDC/1.0 A
Utilization category UL508 240 V AC/1.5 A / DC 120 VDC/1.0 A (General Purpose)
IP rating: contacts/terminals IP40/IP00, IP60/00, IP67/00
Contact material Silver or gold-plated silver
Short-circuit protection 10 A gL
Actuators, operating positions
Actuator Push button, roller lever
Free position 8.85 ±0.15 (push button)
Operating position 6.60 ±0.25 (push button)
Release position 8.00 ±0.25 (push button)
Total positive opening travel 4.20 (push button)
Total travel position < 3.90 (push button)
Movement differential (between operating and release position) 1.4 (typical, push button)
Mechanical data
Front mount yes, front mounting by nut retainers M3
Ganging (side mount) yes, side mount
Vibration resistance 30 g max. (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time)
Shock resistance 50 g max., half sinus (without aux. actuator at 0.1 ms max. opening time)
Housing material PEI, amber transparent
Mechanical endurance 10 million cycles min.
Temperature range -55 °C … +85 °C
Note Data valid for new switches with silver contacts

Related Downloads

Catalogue D47 – Snap-action switches S847, S947
Changeover switches featuring wiping, galvanically isolated, double-break contacts and positive opening operation
Brochure Snap-action Switches
Switches for safety-related applications with robust and precise switch mechanism and positive opening operation
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

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