ABB e1t 3s 24dc abb expansion relay

Why Choose the ABB E1T 3s 24DC 2TLA010030R5000 Safety Expansion Relay?

The ABB E1T 3s 24DC 2TLA010030R5000 is a dedicated safety expansion relay with delayed outputs, designed to increase the number of safe relay outputs available from an existing machine safety relay. Part of the established ABB Jokab Safety E1T range, this module provides four redundant normally open outputs for controlling additional contactors, actuators and hazardous machine functions.

Operating from a 24 V DC supply, the E1T 3s provides 4 NO relay outputs with a fixed 3 s switch-off delay. This delayed release allows selected machine functions to remain energised for a controlled period after a stop command, which can be useful where machinery requires a defined run-down or controlled stopping sequence before power is removed from downstream equipment.

The E1T uses mechanically operated internal relays and a monitoring circuit that enables the primary safety relay to supervise correct operation of the expansion module. Its compact 22.5 mm wide DIN rail housing, two LED indicators and quick-release terminal blocks make it suitable for space-conscious industrial control panels. ABB identifies the legacy E1T 3s 24DC as replaced by the newer Sentry TSR10 24VDC.

Key Advantages

• Dedicated safety relay output expansion for industrial machinery.
• 24 V DC supply for integration with common machine safety systems.
• 4 NO safety relay outputs for controlling additional downstream loads.
• Fixed 3 s switch-off delay for controlled machine stopping sequences.
• Suitable for single- or dual-channel connection to the associated safety relay.
• Mechanically operated relays allow monitoring by the primary safety device.
• Maximum resistive switching capacity of 6 A at 250 V AC.
• Supports safety applications up to Category 4 when correctly incorporated into the complete safety system.
• Compact 22.5 mm wide housing minimises DIN rail space requirements.
• Quick-release terminal blocks simplify installation, maintenance and replacement.

Key Features

• ABB Jokab Safety E1T safety expansion relay.
• 24 V DC ±15% operational voltage.
• 1.5 W power consumption.
• 4 normally open relay outputs.
• 3 s fixed off-delay.
• Single- or dual-channel connection capability.
• Mechanically operated internal K1 and K2 relays.
• Monitoring circuit for supervision by the connected safety relay.
• 2 LED indicators for operating-status indication.
• Maximum resistive AC switching capacity of 6 A at 250 V AC / 1500 VA.
• Maximum resistive DC switching capacity of 6 A at 24 V DC / 150 W.
• Maximum total switching capacity of 12 A distributed across all contacts.
• Silver contacts with gold flash.
• Quick-release detachable connector blocks.
• 35 mm DIN rail mounting.

Controlled 3-Second Delayed Safety Output Expansion

The ABB E1T 3s is designed to expand an existing safety relay with four additional outputs while introducing a controlled 3 s switch-off delay. When the primary safety circuit is activated, the E1T's internal relays energise and its normally open outputs can control downstream contactors or other safety-related devices. When a stop signal or power failure occurs, the internal relays drop out after the fixed delay, allowing a defined run-down period before the expanded outputs open.

The internal K1 and K2 relays are mechanically operated and must be monitored through terminals X1 and X2 by the safety relay being expanded. If an output contact sticks closed, the associated monitoring contact cannot return to the required state, preventing a new ready signal from being given to the primary safety relay. This monitored architecture enables the E1T to provide additional delayed outputs while remaining integrated into the overall machine safety function.

Typical Applications

• Expansion of existing machine safety relay outputs.
• Applications requiring a 3 s delayed safety shutdown.
• Machine run-down and controlled stopping sequences.
• Emergency-stop systems requiring delayed auxiliary safety outputs.
• Safety gate and interlocking circuits.
• Control of multiple downstream safety contactors.
• Motor and drive isolation following a controlled stopping period.
• Production machinery and automated manufacturing equipment.
• Conveyor and material-handling safety systems.
• Industrial control panels requiring additional delayed safety contacts.