Allen Bradley 440G-T Series Solenoid Interlock Switch, Power to Unlock, 24V ac/dc

Ensure vital safe-access to machinery for personnel and boost efficiency with the TLS-3-GD2 440G-T Solenoid Interlock Switch, with Power-to-Release, 24V ac/dc, by Allen Bradley Guardmaster.

This device is a positive mode, tongue operated safety interlock switch which keeps a machine guard door securely locked while machinery is in motion, and isolates power when the safety barrier is released. This reduces risk of injury to personnel by limiting access to hazardous areas, and prevents damage to equipment from interference. This affordable guard locking switch works by allowing the safety gate to open only when power is applied to the internal solenoid. This is safer option as sudden loss of power does not allow the guard to be opened, unlike the Power-to-Lock switches. This safety switch is perfectly suited for use with machinery which does not come to an immediate stop.

The 440G-T27134 Power-to-Unlock Switch has a supply voltage of 24VAC/DC and features 2NC Safety Contacts, 1NO Auxiliary Contact, and 2NC Solenoid Contacts. It has a thermal current of 10A and rated insulation voltage of 500V, with M20 Conduit Entry. The operating temperature ranges from -20 to +60 °C (-4…+140 °F) and the housing material is made of UL approved glass-filled PBT. This switch is fitted with a robust stainless-steel actuator guide, for extra protection against actuator damage due to poor guard alignment and wear-and-tear. This switch is suitable for use with PLCs.

• Lid mount status indication ensures quick and easy troubleshooting
• High locking force of 2000 N (450 lb) provides superior stability and security
• Suitable for use in wet environment as it has an Ingress Protection rating of IP67, which ensures that it can withstand some immersion in water and is also dust-tight
• Three manual release points with security screws for use in the event of an emergency
• It has a rotatable head with 2 entry slots and 4 possible actuator entry positions, with blanking plug provided to seal the unused slot
• Ideal for use with hinge, sliding, and lift-off doors
• Key release lids available for unlocking the locking mechanism in emergencies

Actuator is not supplied and must be ordered separately

This safety switch incorporates a power-to-unlock function

With the “power to lock” function, provisions are required to ensure that a dangerous situation cannot result from open circuit faults or power cuts.

EN954-1
ISO13849-1
IEC/EN60204-1
NFPA79
EN1088
ISO14119
IEC/ EN60947-5-1
ANSI B11.19, AS4024
CE certified
UL approved
cULus approved
TUV certified
CCC certified

The Allen Bradley Guardmaster range of machine safety devices offers flexible, cost-effective solutions to enhance productivity in the workplace and provide vital protection for your equipment and personnel.

A solenoid interlock switch is a type of safety switch with an internal solenoid; a wire coil which converts electrical energy to mechanical. This type of mechanism limits access to dangerous areas where machinery may be functioning by ensuring that that barriers remain securely shut. The safety guard can only be opened through either energising (Power to Release) or de-energising (Power to Lock) the solenoid with an external signal. They are often used in industrial environments, for example with high inertia rotating machines.