Snap-action switch S926 – Microswitch with PEI housing for extreme conditions
Changeover contact with self-cleaning mechanism, galvanic isolation and positive opening
S926 a
The snap-action switch S926 is a version with an identical design to the S826 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 S826, 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
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).
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).
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.
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.
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.
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:
Specifications
| 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 | 240 V |
| Pollution degree IEC 60947 | PD 3 (except «screw with saddle clamp»: 250 V: PD3 / 400 V: PD2) |
| Pollution degree UL508 | PD 2 |
| Rated impulse withstand voltage Uimp | 4 kV |
| Utilization category IEC 60947 | AC-15, 230 VAC/1.0 A / DC-13, 110 VDC/0.5 A |
| Utilization category UL508 | AC 240 V / 1 A general purpose |
| IP rating: contacts/terminals | IP40/IP00 |
| Contact material | Silver or gold |
| Short-circuit protection | 6 A gR (silver only) |
| Actuator | Push button, roller lever |
| Free position | 8.85 ±0.20 (push button) |
| Operating position | 6.60 ±0.35 (push button) |
| Release position | 7.80 ±0.35 (push button) |
| Total positive opening travel | 5.85 (push button) |
| Total travel position | < 5.65 (push button) |
| Movement differential (between operating and release position) | 1.2 (typical, push button) |
| Front mount | yes, front mounting by nut retainers M3 |
| Ganging (side mount) | yes, side mount |
| Actuation speed | max. 1.0 m/s, min. 0.5 mm/s |
| Vibration resistance | 10 g (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time) |
| Shock resistance | 30 g, 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 max., dependent on version |
| Note | Data 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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