Snap-action switch S947 with pushbutton and screw connections
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
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 |
| 10 A at T = 85°C | |
| 10 A at T = 85°C | |
| 400 V | |
| 300 V | |
| Pollution degree IEC 60947 | PD 3 |
| Pollution degree UL508 | PD 3 |
| 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) |
| 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 |
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