Allen Bradley 440G-T27121 Guard Locking Switch

The AB 440G-T27121 is a TLS-GD2 guard locking safety switch designed for safeguarding personnel by locking machine guards in position until hazardous motion has ceased. Operating on 24V AC/DC, it provides 2 normally closed safety contacts and 1 normally open auxiliary contact in a rugged plastic housing with a quick-break switching mechanism.

This model uses the quiescent current principle, meaning the solenoid is energized to unlock the guard, offering a higher level of safety in the event of power failure. With a clamping force of 2000 N and IP67 protection, it is ideal for harsh industrial applications. The switch includes an M20 conduit entry and does not include an actuator, allowing flexible selection to suit your application.

Technical Specifications

Model: 440GT27121
Series: TLS-GD2
Type: Guard Locking Safety Switch
Solenoid Voltage: 24V AC/DC
Contact Configuration: 2 x NC (safety), 1 x NO (auxiliary)
Actuator Included: No
Guard Locking Type: Quiescent current principle
Switching Contact Type: Quick-break
Conduit Entry: M20 (metric cable entry)
Application: Machine guarding, gate interlocking, safety zone access control

Electrical Specifications

Rated Control Supply Voltage (AC 50 Hz): 24 V
Rated Control Supply Voltage (DC): 24 V
Rated Operational Current:
– 6 A @ 125 V AC (AC-15)
– 3 A @ 230 V AC (AC-15)
– 2 A @ 24 V DC (DC-13)
Contact Type: Electromechanical
Number of Changeover Contacts: 0
Number of Normally Closed Contacts: 2
Number of Normally Open Contacts: 1
Safety Function Compliance: Yes
Actuator Release: Requires compatible actuator (sold separately)

Mechanical Specifications

Width: 91 mm
Height: 126 mm
Depth: 33 mm
Housing Material: Plastic
Clamping Force: 2000 N
Housing Coating: Uncoated
Mounting Type: Surface mount
Connection Type: M20 cable entry
Escape Release: No
Status Indication: Yes (visual window)

Environmental Specifications

Operating Temperature Range: –20…+60 °C
Storage Temperature: –40…+85 °C
Relative Humidity: 5%…95% non-condensing
IP Rating: IP67 (dust-tight and water-resistant)
Explosion Safety – Gas: None
Explosion Safety – Dust: None
Shock/Vibration: IEC 60068 compliant
Certifications: CE, UL, cULus, RoHS
Application in Commercial/Residential Areas: Permitted

Compliance & Communication

Safety Standards:
– EN ISO 14119
– ISO 13849-1
Safety Outputs: 2 NC contacts
Auxiliary Outputs: 1 NO contact
Communication Protocols: Not applicable (hardwired switch)
Wiring Type: Screw terminals via M20 conduit
Diagnostics: Visual status indicator only

Key Features & Benefits

✅ Dual NC Safety Contacts – Designed to meet high safety performance levels

✅ Quiescent Current Locking – Guard remains locked on power loss, increasing fail-safe integrity

✅ High Retention Force – 2000 N clamping strength for secure guard locking

✅ Compact IP67 Design – Dust-tight, water-resistant housing for industrial environments

✅ Flexible Actuator Options – Compatible with a wide range of TLS-GD2 actuators (sold separately)

✅ Visual Status Indication – Built-in indicator window for fast verification

📦 Order the Allen Bradley 440G-T27121 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440G-T27121 prices. With competitive availability and expert support, we ensure you receive the best safety interlock solutions for protecting your personnel and machinery.

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