For a more secure, safe, and efficient guard-locking system the 440G-T27138 TLS-3-GD2 Solenoid Interlock Switch by Allen Bradley Guardmaster is an ideal solution. This unit is a positive mode, tongue-operated interlock switch that ensures guards are safely locked while the power supply to the machine is on. It features a rotatable head with 2 entry slots, offering 4 actuator entry options. A blanking plug is provided to seal the unused slot.

With the TLS-3-GD2 switch the barrier can only open when the internal solenoid is energised by an external signal. In addition, the power supply is isolated when the safety barrier is released. This helps to avoid the risk of machine operators entering an unsafe area where machinery could be in motion and cause serious injury. This safety interlock switch is perfectly suited for use with machines which do not stop instantly, or which may be damaged by interference while in motion. It ensures that your personnel are well protected and your machine processes can run seamlessly, helping to minimise downtime and improve efficiency.

The 440G-T27138 TLS-3-GD2 Guard-locking Switch is Power-to-Release. It has M20 conduit entry, 2NC safety contacts and 1NO auxiliary contact. This safety interlock switch has a high holding force of 2000N (450 lbs) for improved stability of the safety barrier. It is also sealed to IP67, making it ideal for use in wet environments where machinery is regularly washed down. The solenoid voltage is 110 V ac/dc and the solenoid contacts are 2NC. The housing material is made of durable UL approved glass-filled PBT and it has an operating temperature range of -20°C to +60°C (-4°F to +140°F). The versatile TLS-3-GD2 safety switch is also suitable for use with PLCs.

Note: Actuator is not supplied and must be ordered separately. This unit incorporates a power-to-unlock function.

• Convenient rotatable head with four possible actuator entry points
• Blanking plug allows the unused slot to be sealed
• Stainless-steel actuator guide fitted to protect the unit from actuator damage due to poor guard alignment or wear
• Five contacts: 2NC/1NO for door position monitoring, 2NC for lock monitoring
• Suitable for use with PLCs
• Three manual release points with security screws allow release in emergencies
• IP67 rated, ensuring no ingress of dust particles and durable against temporary immersion in water

Warning: With the “power to lock” function switches, 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
IP67 rated

Solenoid interlock switches work by having their internal solenoid energised (Power to Release) or de-energised (Power to Lock) by an external signal. The solenoid is a wire coil which converts electrical energy into mechanical energy. These types of safety switches are often used in industrial environments on machine guards to monitor the barrier status and limit unsafe access to hazardous equipment. They ensure that safety barriers remain securely locked while dangerous processes are running. They are useful with machinery that does not instantly stop, such as high inertia rotating machines.

Rockwell Automation is a global leader in industrial automation and digital transformation, and brings smart manufacturing to life. With a long legacy of creating Allen-Bradley® integrated control and information solutions, we help make you as productive as possible. Our portfolio of sensing, safety and motor control products can support your move towards smart machine applications. Allen-Bradley® IO-Link sensors are data-enabled and communicate with all field buses, providing diagnostic and health information about the device before a machine stops, and enabling quick production changeovers through fast parameter downloads from PLCs into the device. This reduces machine downtime and increases manufacturing OEE. For safety components, products with built-in diagnostics simplify the set-up of the smart device, and reduce maintenance, leading to a more efficient, machine data-driven approach.