Machine Guarding & Safety Interlock Solution — Allen-Bradley 440G-T27256 | TLS2-GD2 Series
Where This Product Is Used
The Allen-Bradley 440G-T27256 (TLS2-GD2) is a solenoid-controlled guard locking safety interlock switch engineered for applications where machine access must be positively controlled during hazardous motion. Typical deployment environments include:
- Robotic work cells — prevents gate entry while robot arm is in motion; integrates with safety PLCs for zone control
- CNC machining centers — locks enclosure doors during spindle operation; unlocks only after full stop confirmed
- Automated conveyor & palletizing lines — guards access points at transfer stations and accumulation zones
- Injection molding & press machinery — secures mold-area guards during high-force cycles
- Pharmaceutical & food processing lines — stainless-compatible mounting; withstands washdown-adjacent environments
- Power distribution & switchgear enclosures — prevents panel access during live-bus conditions
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Catalog Number | 440G-T27256 |
| Series / Model | TLS2-GD2 |
| Product Family | TLS2 (Trojan 5 GD) Guard Locking Safety Interlock |
| Locking Mechanism | Solenoid-controlled power-to-release (or power-to-lock, per wiring) |
| Safety Category | Up to Category 4 / PLe per ISO 13849-1 |
| Safety Integrity Level | SIL 3 capable (IEC 62061) |
| Operating Voltage | 24 V DC |
| Locking Force | 2,000 N (min.) |
| Actuator Type | Tongue actuator (non-contact coded) |
| Output Contacts | 2 x Safety (NC) + 1 x Auxiliary (NO) |
| Connection | M12 connector (pre-wired or plug-in) |
| Enclosure Rating | IP67 |
| Operating Temperature | -25 °C to +70 °C |
| Housing Material | Glass-filled nylon / die-cast zinc |
| Mounting | 4-hole flange, multiple orientations |
| Weight | Approx. 100 g (controller unit) |
| Country of Origin | USA / Global Rockwell supply chain |
Specifications are reference values. Always verify against the official Rockwell Automation product datasheet before design-in.
Why Engineers Specify This Model
- Dual-channel safety architecture — redundant NC contacts satisfy Category 4 / PLe requirements without external relays in many topologies
- Coded tongue actuator — RFID-coded or mechanically coded options defeat simple defeat attempts; supports high-coding-level requirements per ISO 14119
- Solenoid guard locking — positive locking holds the guard closed until the machine reaches a safe state, critical for high-inertia drives and stored-energy hazards
- IP67 sealing — suitable for coolant mist, dust, and light washdown without additional enclosure
- Direct integration with Allen-Bradley safety ecosystem — plug-and-play with GuardLogix, SmartGuard, and Safety Relay modules; reduces wiring complexity
- Wide temperature range — reliable from cold-storage automation to foundry-adjacent environments
Complete System Bill of Materials
For a fully functional guard locking safety circuit, engineers typically specify the following alongside the 440G-T27256:
- Safety Controller / Relay — Allen-Bradley GuardLogix 5580 (1756-L8xES) or MSR127RP safety relay
- Safety I/O Module — 1791DS-IB8XOBV4 or equivalent dual-channel input module
- M12 Safety Cable — 889D-F8AB-x (5-pin, shielded) for solenoid and monitor circuits
- Replacement Actuator — 440G-A27019 (tongue actuator, coded, matching series)
- Mounting Bracket — 440G-A27070 or application-specific weld/bolt bracket
- 24 VDC Power Supply — 1606-XLP95E or equivalent safety-rated PSU
- E-Stop Button — 800FM-MT44 (for manual reset integration)
Compliance & Industry Standards
- ISO 13849-1:2015 — Safety of machinery: up to Category 4 / Performance Level e (PLe)
- IEC 62061 — Functional safety: SIL 3 capable subsystem
- ISO 14119:2013 — Interlocking devices associated with guards
- IEC 60947-5-3 — Proximity switches for safety-related applications
- UL 508 / UL 508A — Industrial control equipment (UL Listed)
- CE Marking — Machinery Directive 2006/42/EC compliant
- RoHS compliant
Quality Assurance & Sourcing
Konmask.com specializes in industrial automation components for B2B buyers requiring verified, spec-accurate parts. Our sourcing process for the 440G-T27256 includes:
- Authorized & verified supply channels — parts traced to Rockwell Automation authorized distribution networks
- Pre-shipment inspection — label verification, date code review, and packaging integrity check
- Documentation package — certificate of conformance and packing list provided on request
- Counterfeit mitigation — hologram, QR code, and physical marking cross-checked against Rockwell standards
- Warranty — 12-month warranty against manufacturing defects; DOA replacement policy
How to Source This Part
- Add to cart and proceed to checkout — we accept T/T bank transfer, PayPal, and major credit cards
- Request a quote — for orders of 5+ units, contact support@konmask.com for volume pricing and lead time confirmation
- Provide your BOM — send your full bill of materials; our team will cross-reference availability and suggest in-stock alternatives if needed
- Expedited shipping available — DHL Express, FedEx International Priority, and sea freight options for bulk orders
- Export documentation — commercial invoice, packing list, and HS code declaration provided for customs clearance
Application-Specific FAQ
Q: Can the 440G-T27256 be used in a Category 4 / PLe safety loop without an external safety relay?
A: Yes — when wired in a dual-channel configuration to a compatible safety controller (e.g., GuardLogix or SmartGuard), the TLS2-GD2 meets Category 4 / PLe requirements natively. Consult the Rockwell Safety Reference Manual (publication 440G-UM001) for validated circuit topologies.
Q: What is the difference between power-to-release and power-to-lock wiring?
A: Power-to-release (de-energize to lock) is the fail-safe default — loss of power keeps the guard locked. Power-to-lock is used where the guard must remain open during power-off maintenance. The 440G-T27256 supports both; wiring configuration determines behavior.
Q: Is the actuator included?
A: The controller unit (440G-T27256) is sold separately from the actuator tongue. The matching actuator is 440G-A27019. Please confirm your BOM includes both components.
Q: What is the lead time for this part?
A: In-stock units ship within 1–3 business days. For out-of-stock situations, typical lead time is 2–6 weeks depending on Rockwell supply chain status. Contact us for real-time availability.
Q: Can Konmask provide a certificate of conformance?
A: Yes. A certificate of conformance (CoC) is available upon request at no additional charge for all orders.
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