Snap-action switch S820 – Microswitch for increased current carrying capacity
Robust changeover contact with galvanic isolation and positive opening.
S820 a L
The S820 snap-action switch is a robust microswitch with positive opening. Its contact system and shifting gate are designed for the conducting and disconnecting of high currents. At 20 amps, the continuous thermal current is twice as high as in other snap-action switches of the ‘F’ design, and the switch power is also multitudes greater than other snap-action switches. Thanks to its strong springs, this microswitch holds its switch state even in the event of heavy shocks and vibrations. The S820 is used in particularly tough conditions. The two contact bridges of the changeover contact can connect two galvanically isolated electric circuits. The break contacts are protected by a mechanical positive opening. The S820 is therefore suitable as an end position switch or position switch in safety applications.
Features
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).
A contact bridge spreads the breaking capacity over two contact points. The contact material is silver. For the switching of high direct currents, we recommend blow magnets for preventing electric arcs (optional).
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.
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.
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 Za) snap-action switch with 4 terminals, positive opening operation, and 2 galvanically isolated contact bridges |
| Conv. thermal current Ith EN60947 | 20 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/5.0 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 |
| Contact material | Silver |
| Short-circuit protection | 10 A gL |
| Actuator | Push button, roller lever |
| Free position | 9.00 ±0.15 (push button) |
| Operating position | 6.00 ±0.35 (push button) |
| Release position | 8.00 ±0.35 (push button) |
| Total positive opening travel | 5.20 (push button) |
| Total travel position | 5.00 min. (push button) |
| Movement differential (between operating and release position) | 2.00 (typical, push button) |
| Front mount | yes, front mounting by nut retainers M3 |
| 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 | 60 g, half sinus (without aux. actuator at 0.1 ms max. opening time) |
| Housing material | PC, beige transparent |
| Mechanical endurance | 1 million cycles min. |
| Temperature range | -40 °C … +85 °C |
| Note | Data valid for new switches with silver contacts |
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