Snap-action switch S840 – Compact microswitch in a conventional design
Changeover contact with self-cleaning contacts and positive opening.
S840 k28 Snap-action switch S840 with flat lever and connections for flat plugs and soldering lugs
S840 b28 Snap-action switch S840 with flat lever and connections for flat plugs and soldering lugs
S840 v20 Snap-action switch S840 with roller lever and connections for flat plug
S840 b Snap-action switch S840 with pushbutton and screw terminals
The S840 snap-action switch is a high-quality microswitch in a conventional design. 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 low voltages and currents safely and reliably. The S840 monitors the end positions or positions in safety applications.
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.
Dimensions 30 x 16.5 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:
Specifications
Electrical Data
| Contact configuration | SPDT (Form C) snap-action switch with 3 terminals, positive opening operation, and wiping action |
| 6 A at T = 85°C | |
| --- | |
| 250 V | |
| 300 V | |
| Pollution degree IEC 60947 | PD 3 |
| Pollution degree UL508 | PD 3 |
| 2.5 kV | |
| Utilization category IEC 60947 | AC-15, 230 VAC/1.5 A |
| Utilization category UL508 | 240 V AC / 1 A (General Purpose), 240 V AC / 6 A (Resistive), 24 V DC / 6 A (Resistive), B300 - 240 V AC Std. pilot duty, B300 - 125 V AC Std. pilot duty |
| IP40/IP00 | |
| Contact material | Silver or gold |
| Short-circuit protection | 6 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 | 15.0 ±0.2 (push button) |
| Total positive opening travel | 13.6 (push button) |
| Total travel position | < 13.5 (push button) |
| Movement differential (between operating and release position) | 0.2 (typical, push button) |
Mechanical data
| Front mount | --- |
| Ganging (side mount) | yes, side mount |
| Vibration resistance | 5 g (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time) |
| Shock resistance | 15 g, half sinus (without aux. actuator at 0.1 ms max. opening time) |
| Housing material | PC, green transparent |
| Mechanical endurance | 10 million cycles min. |
| Temperature range | -40°C ... +85°C |
| Note | Data valid for new switches with silver contacts |
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