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ABB SENTRY SSR42 24VDC 2no + 2no delayable
ABB Sentry SSR42 2TLA010053R0400 is a 24 V DC safety relay with two immediate NO failsafe outputs, two NO outputs with a fixed 1.5-second OFF-delay, manual or automatic reset and monitoring for contact-based and OSSD safety devices.
£223.45
Why Choose the ABB Sentry SSR42 24VDC 2TLA010053R0400 Safety Relay?
The ABB Sentry SSR42 24VDC 2TLA010053R0400 is a compact machine safety relay with immediate and delayed safety outputs, designed for monitoring safety-related circuits in industrial machinery and automation systems. Part of ABB's Sentry SSR family, the SSR42 can monitor safety devices with contacts using one or two equivalent channels, as well as compatible safety devices equipped with OSSD outputs.
Operating from a 24 V DC supply, the SSR42 provides 2 NO immediate failsafe relay outputs plus 2 delayed NO failsafe relay outputs. The two delayed contacts incorporate a fixed 1.5 s OFF-delay, allowing selected machine functions to remain active for a controlled period after a safety demand while the two immediate outputs respond without the intentional delay.
The SSR42 supports manual or automatic reset, selectable by a switch on the front of the relay, and is suitable for monitoring emergency stops, safety gate switches and compatible OSSD devices such as light curtains. The 2TLA010053R0400 version uses screw-compression connection blocks and a slim 22.5 mm wide DIN rail housing. ABB specifies Sentry safety relays for applications up to PL e / SIL 3 when correctly configured, integrated and validated.
Key Advantages
- Combines immediate and delayed safety outputs in one compact relay.
- 2 NO immediate + 2 NO delayed failsafe relay outputs.
- Fixed 1.5 s OFF-delay on the two delayed outputs.
- 24 V DC supply for standard industrial machine-safety systems.
- Supports safety devices with one or two equivalent contact channels.
- Compatible with appropriate safety devices using OSSD outputs.
- Suitable for emergency-stop and safety gate monitoring.
- Manual or automatic reset selectable from the relay front.
- Supports safety applications up to PL e / SIL 3 when correctly integrated.
- Compact 22.5 mm wide DIN rail design conserves control-panel space.
Key Features
- ABB Sentry SSR42 safety relay.
- Manufacturer part number 2TLA010053R0400.
- 24 V DC rated control supply.
- 2 NO immediate failsafe relay outputs.
- 2 NO delayed failsafe relay outputs.
- 1.5 s fixed OFF-delay on the delayed outputs.
- Single-channel contact safety-device monitoring.
- Dual equivalent-channel contact safety-device monitoring.
- Compatible OSSD safety-device monitoring.
- Emergency-stop monitoring.
- Safety gate-switch monitoring.
- Manual / automatic reset selection.
- Front-mounted reset-selection switch.
- Rated operational current of 3 A for applicable AC-15 and DC-13 utilisation categories.
- Screw-compression connection blocks.
- IP20 degree of protection.
- DIN rail mounting to IEC 60715.
Immediate and 1.5-Second Delayed Safety Control
The ABB Sentry SSR42 combines two immediate and two delayed failsafe contacts within a single compact safety relay. When the monitored safety circuit changes to an unsafe state, the two immediate normally open outputs can respond directly while the remaining two normally open outputs are held for the fixed 1.5 s OFF-delay before opening. This arrangement can support controlled stopping sequences where one part of the machinery must remain enabled briefly while another safety function is removed immediately.
Input monitoring supports contact-based safety devices using either one channel or two equivalent channels, together with compatible OSSD-output safety devices. Manual or automatic reset can be selected using the front-mounted switch, allowing the relay's restart behaviour to be matched to the requirements of the machinery safety function. The combination of contact monitoring, OSSD compatibility and delayed outputs makes the SSR42 particularly useful where controlled machine run-down is required.
Typical Applications
- Emergency-stop safety circuits.
- Safety gate and guard-switch monitoring.
- Light curtain and compatible OSSD safety-device monitoring.
- Machinery requiring immediate and delayed safety outputs.
- Controlled machine stopping and run-down sequences.
- Motor, drive and contactor shutdown sequencing.
- Industrial automation and assembly lines.
- Production and packaging machinery.
- Food and beverage processing equipment.
- Pharmaceutical manufacturing machinery.
- Conveyor and material-handling systems.
- Industrial control panels requiring a fixed 1.5 s safety OFF-delay.
Technical Specifications
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| Reset Type | Manual or automatic / monitored | |
|---|---|---|
| Safety Outputs | 4NO | |
| Device Type | Safety relay module | |
| Contacts | 4NO | |
| SIL (up to) | SIL 3 | |
| Timing Function | Delayed outputs | |
| Coil / Supply Voltage | 24 V DC | |
| IP Rating | IP20 | |
| Manufacturer | ABB | |
| Product family | Sentry Safety Relays | |
| Product main type | SSR | |
| Series | SSR42 | |
| Model | Sentry SSR42 24VDC | |
| Manufacturer part number | 2TLA010053R0400 | |
| Product type | Safety relay with delayed outputs | |
| Rated control supply voltage | 24 V DC | |
| Immediate failsafe outputs | 2 NO | |
| Delayed failsafe outputs | 2 NO | |
| Total failsafe relay outputs | 4 NO | |
| Timer function | Yes | |
| Timer relay type | OFF-delay | |
| OFF-delay time | 1.5 s | |
| Reset modes | Manual / automatic | |
| Reset selection | Front-mounted switch | |
| Single-channel contact monitoring | Yes | |
| Dual equivalent-channel contact monitoring | Yes | |
| OSSD device monitoring | Yes | |
| Emergency-stop monitoring | Yes | |
| Gate-switch monitoring | Yes | |
| Two-hand control | No | |
| Safety mat / edge / bumper monitoring | No | |
| Rated operational current AC-15 | 3 A | |
| Rated operational current DC-13 | 3 A | |
| Safety category | Up to Category 4 | |
| Performance Level | Up to PL e | |
| Safety Integrity Level | Up to SIL 3 when correctly integrated | |
| Connection technology | Screw-compression connection blocks | |
| Single conductor capacity | 0.2–3.3 mm² | |
| Two conductor capacity | 0.2–1.5 mm² per conductor | |
| Terminal tightening torque | 0.7 N·m | |
| Wire stripping length | 6.5 mm | |
| Recommended screwdriver | M3.5 | |
| Mounting | TH35-7.5 / TH35-15 DIN rail to IEC 60715 | |
| Degree of protection | IP20 | |
| Product net height | 120 mm | |
| Product net width | 22.5 mm | |
| Product net depth | 120 mm | |
| Product net weight | 0.207 kg | |
| GTIN / EAN | 7350024483338 | |
| HS Code | 85364900 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB Sentry SSR42 2TLA010053R0400 used for?
The ABB Sentry SSR42 is a machine safety relay designed to monitor safety devices with one or two equivalent contact channels and compatible OSSD outputs, including applications involving emergency stops, safety gates and electro-sensitive protective equipment.
What supply voltage does the ABB SSR42 require?
The Sentry SSR42 2TLA010053R0400 operates from a rated 24 V DC supply.
How many safety outputs does the ABB Sentry SSR42 have?
The SSR42 provides four normally open failsafe relay outputs. Two are immediate NO outputs and the other two are delayed NO outputs.
What is the delay time of the ABB SSR42 delayed outputs?
The two delayed normally open safety outputs have a fixed 1.5 s OFF-delay. This distinguishes the SSR42 from the related SSR32, which uses a shorter 0.5 s OFF-delay.
Can the ABB SSR42 monitor OSSD safety devices?
Yes. The SSR42 supports monitoring of compatible safety devices with OSSD outputs, including suitable light curtains and other electro-sensitive protective equipment.
Does the ABB SSR42 support manual and automatic reset?
Yes. The reset function can be configured for manual or automatic reset using the selector switch on the front of the relay.
Can the SSR42 monitor emergency stops and safety gates?
Yes. ABB specifies the SSR42 for emergency-stop and gate-switch monitoring, together with compatible single-channel, dual equivalent-channel and OSSD safety-device circuits.
What safety performance can the ABB SSR42 support?
ABB's Sentry safety relay platform supports machinery safety applications up to Performance Level e (PL e) and SIL 3. The achieved safety level depends on the complete safety architecture, configuration, installation and validation.
What type of terminals does 2TLA010053R0400 use?
The 2TLA010053R0400 version uses screw-compression connection blocks. The related SSR42P, part number 2TLA010053R0401, provides Push-in connection blocks.
How large is the ABB Sentry SSR42?
The SSR42 measures approximately 120 × 22.5 × 120 mm (H × W × D) and has a net weight of approximately 0.207 kg, providing four safety outputs in a compact DIN rail format.
Trusted by Machine Safety Professionals
ABB Sentry SSR42 safety relays combine flexible contact and OSSD safety-device monitoring with two immediate and two delayed failsafe outputs, providing a compact 24 V DC solution for industrial machinery requiring a controlled 1.5 s safety OFF-delay.
