The SR3D safety relay is a compact and powerful device designed for reliable monitoring of emergency stop buttons, sliding guards, and light curtain systems. Functioning as a secure coupling relay, it delivers maximum protection for a wide range of machine and plant safety applications.

Equipped with three instant safety contacts and a switching capacity of up to 8 A at 250 VAC, the SR3D is built to handle demanding safety tasks. It supports both automatic and monitored manual start modes, ensuring easy integration into modern safety systems.

Certified to key international safety standards such as EN ISO 13849-1, EN 62061, IEC 61508, and IEC 61511, the SR3D achieves the highest safety levels: PL e, Category 4, and SILCL 3. This ensures dependable operation in critical safety environments.

Its slim 22.5 mm housing makes it ideal for space-constrained control cabinets. Wiring flexibility is ensured with options for fixed screw terminals, pluggable screw terminals, or push-in spring connections in TWIN configuration.

Optional accessories such as terminal sets and thermal spacing brackets complete the system.

**Technical Specifications:**

Device name:

• SR3D

Safety functions:

• Emergency stop monitoring
• Sliding guard monitoring
• Light curtain monitoring
• Safety coupling relay

Certifications:

• EN 60204-1
• DIN EN ISO 13849-1
• EN 62061
• EN 50156-1
• EN 746-2
• IEC 61508 Parts 1–2, 4–7
• IEC 61511-1

Approvals:

• CE
• TÜV
• GL

Power supply:

• AC/DC 24 V
• AC 115 V
• AC 230 V

Safety contacts:

• Number: 3
• Type: instant (non-delayed)
• Max. switching capacity: 8 A / 250 VAC (resistive load)

Signaling outputs:

• Number: 1

Start behavior:

• Automatic start
• Or monitored manual start

Safety ratings:

• PL e
• Category 4
• SILCL 3

Width:

• 22.5 mm

Order numbers:

• Fixed screw terminals:
- 472272 (24 V)
- 472271 (115 V)
- 472270 (230 V)

• Pluggable screw terminals:
- 474272 (24 V)
- 474271 (115 V)
- 474270 (230 V)

• Push-in spring terminal (TWIN):
- 475272 (24 V)
- 475271 (115 V)
- 475270 (230 V)


Accessories:

• Set of pluggable screw terminals (EKLS4): 472592
• Set of push-in TWIN terminals (EKLT4): 472595
• Spacer for defined minimum distance between safety relays: 472596