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SRALC21 Lovato SAFETY RELAY LIGHT CURTAINS 2NO+1PNP
Lovato SRALC21 is a 24 V DC single-function safety relay with 2NO safety outputs and 1 PNP status output for monitoring light curtains and other OSSD safety devices up to Category 4, PLe.
£203.08
Why Choose the Lovato SRALC21 Safety Relay?
The Lovato SRALC21 is a compact and reliable single-function safety relay designed for monitoring safety light curtains and other protective devices equipped with OSSD outputs. As part of the Lovato SRA safety relay series, it provides dependable interface and switching functions for machinery safety systems requiring high levels of functional safety.
The SRALC21 features two normally open safety relay outputs and one PNP status output, with forcibly guided relay contacts for reliable safety switching. It supports selectable manual or automatic restart and includes an external device monitoring (EDM) feedback input for supervising connected contactors. LED-based diagnostics help operators identify operating and fault conditions quickly.
With a nominal 24 V DC auxiliary supply and safety performance up to Category 4, PLe according to EN ISO 13849-1, the SRALC21 is ideally suited to industrial machinery using light curtains, laser scanners, RFID safety devices and other equipment with fail-safe OSSD outputs. Its slim 22.5 mm housing mounts directly onto standard 35 mm DIN rail inside electrical control panels.
Key Advantages
- Dedicated single-function safety relay for light curtains and OSSD devices.
- 2NO safety outputs plus 1 PNP signalling output for machine safety integration.
- 24 V DC auxiliary supply suitable for industrial control systems.
- Safety performance up to Category 4 and PLe according to EN ISO 13849-1.
- Selectable manual or automatic restart for flexible machine control.
- External device monitoring (EDM) feedback input for connected contactors.
Key Features
- Lovato SRA safety relay series.
- Designed for safety light curtains and devices with OSSD outputs.
- 2 normally open safety relay outputs with forcibly guided contacts.
- 1 PNP system-status output.
- 2 safety inputs for OSSD monitoring.
- Selectable automatic or monitored manual restart.
- External contactor feedback input for EDM monitoring.
- Test input suitable for safety light curtain applications.
- Alarm and operating diagnostics through LED indication.
- Compact 35 mm DIN rail mounting design.
Reliable Safety Control for OSSD Devices
Safety relays such as the Lovato SRALC21 provide the interface between electro-sensitive protective equipment and the machine control circuit. When a connected light curtain or other OSSD safety device detects an unsafe condition, the relay controls its safety outputs so that hazardous machine operation can be stopped through the associated safety circuit.
The SRALC21 is specifically designed for devices with fail-safe OSSD outputs and combines forcibly guided relay contacts with restart selection, external contactor monitoring and system-status signalling. This makes it well suited to safety systems where dependable monitoring, straightforward diagnostics and compact panel installation are required.
Typical Applications
- Industrial safety light curtain monitoring.
- Machine guarding and access protection systems.
- Laser scanners with OSSD safety outputs.
- RFID safety devices with OSSD outputs.
- Automated production and assembly machinery.
- Packaging and material handling equipment.
Technical Specifications
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| Reset Type | Manual or automatic / monitored | |
|---|---|---|
| Device Type | Safety relay module | |
| Contacts | 2NO | |
| Safety Outputs | 2NO | |
| SIL (up to) | SIL 3 | |
| Timing Function | None (instantaneous) | |
| Auxiliary Contacts | None | |
| IP Rating | IP20, IP40 | |
| HS Code | 85365080 | |
| Manufacturer | Lovato Electric | |
| Series | SRA Safety Relays | |
| Model | SRALC21 | |
| Product type | Single-function safety relay | |
| Function | Monitoring of light curtains and OSSD devices | |
| Safety outputs | 2NO | |
| Feedback / signalling output | 1 PNP | |
| Output type | Relays with forcibly guided contacts | |
| Nominal auxiliary supply | 24 V DC | |
| Number of inputs | 2 | |
| Input voltage | 0–30 V DC | |
| Typical input current | 4.3 mA | |
| AC-1 contact rating | 250 V AC, 6 A, 2000 VA | |
| AC-15 contact rating | 230 V AC, 5 A | |
| DC-13 contact rating | 24 V DC, 2 A | |
| UL 508 rating | B300-Q300 pilot duty | |
| Safety category | Category 4 according to EN ISO 13849-1 | |
| Performance level | PLe according to EN ISO 13849-1 | |
| Mechanical life | >10⁷ cycles | |
| Electrical life | 10⁵ cycles at AC-1 and 360 operations/hour | |
| Insulation voltage | 4 kV | |
| Overvoltage category | III | |
| Protection rating | IP40 front / IP20 terminals | |
| Pollution degree | 2 | |
| Mounting type | 35 mm DIN rail | |
| Dimensions (H × W × D) | 99 × 22.5 × 113.5 mm | |
| Weight | 150 g | |
| Operating temperature | -25 to +55 °C | |
| Storage temperature | -30 to +70 °C | |
| Relative humidity | ≤95% | |
| Certifications | cULus, TÜV | |
| Conformity | EN ISO 13849-1, EN 62061 |
Frequently Asked Questions
What is the Lovato SRALC21 used for?
The SRALC21 is a single-function safety relay designed to monitor safety light curtains and other protective devices equipped with fail-safe OSSD outputs.
What safety outputs does the SRALC21 provide?
The relay provides two normally open safety relay outputs with forcibly guided contacts together with one PNP system-status output.
What supply voltage does the SRALC21 require?
The Lovato SRALC21 has a nominal auxiliary supply voltage of 24 V DC.
What safety performance does the SRALC21 support?
The SRALC21 supports safety systems up to Category 4 and Performance Level PLe according to EN ISO 13849-1.
Where is the SRALC21 typically installed?
The relay is designed for mounting on a standard 35 mm DIN rail inside industrial electrical control panels and machinery safety cabinets.
Trusted Safety Control for Industrial Machinery
Lovato SRA safety relays provide dependable monitoring and control of machinery safety circuits, with the SRALC21 offering a dedicated solution for light curtains and other protective devices equipped with OSSD outputs.
