Snap-action switch S847 – Robust microswitch for medium and low power ranges

Changeover contact with self-cleaning double contacts, galvanic isolation and positive opening, protection class up to IP67

Snap-action switch S847 with pushbutton and screw connections
Snap-action switch S847 with roller lever and screw connections
Snap-action switch S847 with pushbutton and connections for flat plugs
Snap-action switch S847 with pushbutton and connections for flat plugs. IP67 in the contact area
Schnappschalter S847 mit Rollenhebel und Schraubanschlüssen. IP67 im Kontaktraum.
Snap-action switch S847 with roller lever and strand connection. IP67 in the contact and connection area
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We supply the S847 series of snap-action switches in dust and water-proof designs up to IP67. Like the S826, this microswitch can be used in a wide variety of ways. Thanks to its robust structure, the S847 can even connect higher power ranges. The mechanical positive opening ensures the functioning of the break contacts, even if these were to be fused in a short circuit.
The two contact bridges of the S847 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. The S847 therefore also connects low voltages and currents safely and reliably. For use in aggressive environments with low switching frequencies, we recommend gold contacts.
The S847 is suitable for safety applications in rough environments, as a position switch or end position switch, for example.

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).

Continuous thermal current up to 10 A; disconnecting medium power ranges

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).

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.

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.

Shock resistance 30 g, vibration resistance 30 g

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.

Protection class up to IP67 (contact area and connections)

Contact area IP40 Connections IP00 // Screws M3, flat screw 6.3 × 0.8

Contact area IP60 Connections IP00 // Screws M3, flat screw 6.3 × 0.8

Contact area IP67 Connections IP00 // Screws M3, flat screw 6.3 × 0.8

Contact area IP67 Connections IP67 // Stranded wire, lateral, length 500 mm

Dimensions 50 x 36 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:

(d47_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 UL508300 V
Pollution degree IEC 60947PD 3
Pollution degree UL508PD 3
Rated impulse withstand voltage Uimp4 kV
Utilization category IEC 60947AC-15, 230 VAC/1.5 A / DC-13, 110 VDC/1.0 A
Utilization category UL508240 V AC/1.5 A / DC 120 VDC/1.0 A (General Purpose)
IP rating: contacts/terminalsIP40/IP00, IP60/00, IP67/00
Contact materialSilver or gold-plated silver
Short-circuit protection10 A gL
Actuators, operating positions
ActuatorPush button, roller lever
Free position8.85 ±0.15
Operating position6.60 ±0.25
Release position8.00 ±0.25
Total positive opening travel4.20
Total travel position< 3.90
Movement differential (between operating and release position)1.4 (typical)
Mechanical data
Front mountyes, front mounting by nut retainers M3
Ganging (side mount)yes, side mount
Vibration resistance30 g max. (10 … 500 Hz all directions, without aux. actuator at 0.1 ms max. opening time)
Shock resistance30 g max., 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 new switches with silver contacts

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