Snap-action switch S826 – Diverse microswitch for medium and low power ranges

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

S826 b20
Snap-action switch S826 with pushbutton and connections for flat plugs
S826 b
Snap-action switch S826 with pushbutton and screw connections
S826 e
Snap-action switch S826 with roller lever and screw connections
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The snap-action switch S826 is a diverse microswitch for medium and low power ranges. As a changeover contact, it can open one circuit and close a second with one actuation. The mechanical positive opening ensures reliable opening. The two contact bridges are galvanically isolated. In every switch operation, they rub in a defined fashion on the V-shaped fixed contacts and ensure a high level of contact reliability. This snap-action switch is therefore particularly suited to the switching of low currents and voltages in safety applications, primarily as a position switch or as an end position switch. For use in aggressive environments with low switching frequencies, we recommend gold contacts.

Features

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 B)

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
(except «screw with saddle clamp»: 250 V: PD3 / 400 V: PD2)
Rated insulation voltage Ui UL508300 V
Pollution degree IEC 60947PD 3
Pollution degree UL508PD 3
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 (push button)
Operating position6.60 ±0.35 (push button)
Release position7.80 ±0.35 (push button)
Total positive opening travel5.85 (push button)
Total travel position< 5.65 (push button)
Movement differential (between operating and release position)1.2 (typical, push button)
Mechanical data
Front mountyes, front mounting by nut retainers M3
Ganging (side mount)yes, side mount
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 materialPC, green transparent
Mechanical endurance10 million cycles min.
Temperature range-40 °C ... +85 °C
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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