ABB JSBT4 24DC Safety relay

Why Choose the ABB JSBT4 24DC 2TLA010004R0000 Safety Relay?

The ABB JSBT4 24DC 2TLA010004R0000 is a robust dual-channel machine safety relay designed for monitoring safety-related circuits in industrial machinery and automation systems. Part of the proven ABB Jokab Safety JSB series, the JSBT4 provides synchronised dual-input monitoring and positively guided relay outputs for applications including emergency stops, safety gates, safety mats, contact strips and enabling devices.

Operating from a 24 V DC supply, the JSBT4 provides 3 NO safety outputs plus 1 NC information output. Its two safety input channels are synchronised, with the inputs normally required to close within 0.5 s of one another, enabling dependable monitoring of dual-channel safety devices and helping detect faults within the safety circuit.

The JSBT4 incorporates internal supervision of its inputs and output relays, together with a test circuit that can be used for reset and supervision of external contactors, relays or valves. With support for applications up to Category 4, PL e and SIL 3, a compact 45 mm wide DIN rail housing and clear LED indication, it provides a dependable solution for demanding machine-safety installations.

Key Advantages

• Reliable dual-channel safety relay for industrial machinery.
• 24 V DC supply compatible with common industrial control systems.
• 3 NO safety outputs and 1 NC information output.
• Synchronised dual inputs with a 0.5 s synchronisation requirement.
• Internal monitoring of both input channels and safety relays.
• Supports external contactor, relay and valve supervision.
• Suitable for applications up to Category 4, PL e and SIL 3.
• Fast deactivation response of less than 20 ms under normal input switching.
• Compact 35 mm DIN rail mounting format for control cabinets.

Key Features

• ABB Jokab Safety JSBT4 safety relay.
• 24 V DC ±15% power supply.
• Synchronised dual-channel safety inputs.
• 3 NO safety relay outputs.
• 1 NC information output for monitoring and indication.
• 0.5 s input synchronisation.
• Maximum resistive switching capacity of 6 A at 250 V AC per specified output conditions.
• Maximum total resistive switching capacity of 12 A distributed across all contacts.
• Electrical supply, input and output LED status indication.
• Safety performance up to PL e and SIL 3.
• Category 4 safety capability.
• IP40 enclosure and IP20 terminals.
• Screw-terminal electrical connections.
• Standard 35 mm DIN rail mounting.

Reliable Synchronised Dual-Channel Safety Monitoring

The ABB JSBT4 monitors two independent safety input channels through terminals S13-S14 and S23-S24. When both channels close within the required 0.5 s synchronisation period and the test circuit conditions are satisfied, the internal safety relays energise and enable the three normally open safety outputs. Opening either safety channel, detecting a cross-circuit condition or losing the supply causes the safety relays to de-energise.

Its internal supervision circuitry monitors both input channels and the internal relays, while the X1-X2 test circuit can be incorporated into reset and external-device monitoring arrangements. This architecture makes the JSBT4 suitable for safety gates, emergency stops, safety mats, enabling devices and other machinery safeguards where reliable dual-channel monitoring is required.

Typical Applications

• Emergency-stop safety circuits.
• Safety gate, hatch and interlocking switch monitoring.
• Safety mats and pressure-sensitive contact strips.
• Hold-to-run and enabling devices.
• Foot-operated safety controls.
• Machine area supervision.
• External safety output expansion.
• Monitoring external contactors, relays and valves.
• Industrial machinery and production-line safety systems.