The 3SE7 series of grab wire switches (trip wire switches, cable operated switches) are used for monitoring or for EMERGENCY STOP devices on particularly dangerous system sections.
As the effective range of a grab wire switch is only limited by the length of the grab wire, large systems can also be protected. Switches (requiring pulling at both ends) and conveyor belt unbalance trackers are used primarily for monitoring very long belt systems.

The switches for wire lengths up to 50m are available with 1 NO + 1 NC or 2 NC contacts and for up to 75m with 1 NO + 3 NC contacts. The switches for wire lengths of 2 ´ 75m and the conveyor belt unbalance trackers are supplied with 2 NO + 2 NC contacts.
The grab wire switch and the conveyor belt unbalance tracker are also available with a factory fitted LED (red, 24 V DC). This light has innovative on board chip technology that allows the operating state of the switch to be visible at a distance of at least 50m.

The NC contacts of the grab wire switch and the conveyor belt unbalance tracker are positive opening. The grab wire switches with one side operation are held in free position by the pre-tension on the turnbuckle. In the 3SE7 140 and 3SE7 150 grab wire switches, both switching contacts are available for wire-break/wire-pull signalling. The NO contact can be used, for example, for signalling purposes. On switches with interlocking, with a pre-tensioned wire, the locking must be deactivated beforehand in order to return the grab wire switch to its original position.

Positive latching and positive NC contacts
Switches for wire lengths up to 75m
Metal housing
Enclosure is screw mounted
IP67 rating
Operating temperature: -25 to +70°C

Stock nos. 764-4341, 764-4301, 764-4304, 764-4357 are fitted with an indicator light.

UL,CSA

The switches are equipped with positive latching and positive NC contacts and are therefore suitable for operation in EMERGENCY STOP devices in accordance with EN ISO 13850. They are usable up to Category 4 according to EN 954-1.

When it comes to workplace safety, this emergency rope pull switch from Siemens takes the strain. As it's designed to work with a 75m cable, it provides protection along the length of even the bulkiest or most inconveniently shaped equipment. This means no matter where your personnel might be standing, they can stop the machine in a matter of seconds if a fault or hazard occurs. A nifty rotate-to-unlatch mechanism requires a manual reset after the wire has been pulled, so you can rest assured that once stopped, the problem process won't restart until you're ready. You'll find rope pull switches like this protecting conveyor belts, packaging machinery and vehicle production lines.

• Mechanical durability of 100,000 cycles for a long service life
• Watertight IP67 rating means it's protected against high-pressure jets from all directions
• Wide operating temperature range between -25°C and +70°C for compatibility with extreme conditions

This hardy switch has an aluminium alloy enclosure to keep its sensitive electrical components functioning at peak efficiency in demanding environments. A tough plastic cover offers durable yet comfortable handling, while highly conductive silver contacts provide an electrical connection you can depend on.