Snap-action switch S926 – Microswitch with PEI housing for extreme conditions

Changeover contact with self-cleaning mechanism, galvanic isolation and positive opening

Snap-action switch S926 with pushbutton and connections for flat plugs
Snap-action switch S926 with pushbutton and screw connections
Snap-action switch S926 with roller lever and screw connections
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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

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).

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.

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.

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.

Dimensions 50 x 28.5 x 12 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:

(d26_en.pdf)

Specifications

Electrical Data
Contact configurationSPDT-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 EN6094710 A at T = 85°C
Conv. thermal current Ith UL50810 A at T = 85°C
Rated insulation voltage Ui EN60947400 V
Rated insulation voltage Ui UL508240 V
Pollution degree IEC 60947PD 3
(except «screw with saddle clamp»: 250 V: PD3 / 400 V: PD2)
Pollution degree UL508PD 2
Rated impulse withstand voltage Uimp4 kV
Utilization category IEC 60947AC-15, 230 VAC/1.0 A / DC-13, 110 VDC/0.5 A
Utilization category UL508AC 240 V / 1 A general purpose
IP rating: contacts/terminalsIP40/IP00
Contact materialSilver or gold
Short-circuit protection6 A gR (silver only)
Actuators, operating positions
ActuatorPush button, roller lever
Free position8.85 ±0.20
Operating position6.60 ±0.35
Release position7.80 ±0.35
Total positive opening travel5.85
Total travel position< 5.65
Movement differential (between operating and release position)1.2 (typical)
Mechanical data
Front mountyes, front mounting by nut retainers M3
Ganging (side mount)yes, side mount
Actuation speedmax. 1.0 m/s, min. 0.5 mm/s
Vibration resistance10 g (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time)
Shock resistance30 g, half sinus (without aux. actuator at 0.1 ms max. opening time)
Housing materialPEI, amber transparent
Mechanical endurance10 million cycles min.
Temperature range-55 °C ... +105 °C max., dependent on version
NoteData 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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