24 VDC Coil Voltage Safety Relay with Force-Guided Contact Mechanism and 8A Rated Contact Current for Industrial Applications
Specifications
Manufacturer:
TE
Product Number:
SR4D4024
Description:
RELAY SAFETY 4PST 8A 24V
Highlight:
24 VDC Coil Voltage Safety Relay
,Force-Guided Contact Mechanism DC Relay
,8A Rated Contact Current Industrial Relay
Introduction
SR4D4024 Monostable DC Safety Relay
A monostable (non-latching) 24 VDC relay engineered for safety-critical control circuits in industrial machinery and automation systems.
Core Functions & Specifications
Force-Guided Contact Mechanism
- Complies with EN 61810-3 safety relay standards
- All four contacts are mechanically linked for fail-safe operation
- Contact configuration: 2 Normally Open (NO) + 2 Normally Closed (NC)
Coil & Electrical Characteristics
| Coil Voltage | 24 VDC |
| Coil Resistance | 720 Ω |
| Coil Power | 800 mW (0.8 W) |
| Coil Current | ~33.3 mA |
| Pick-up Voltage | ≤ 18 VDC |
| Drop-out Voltage | ≥ 2.4 VDC |
Contact Performance
| Rated Contact Current | 8 A (AC/DC) |
| Rated Contact Voltage | 250 VAC |
| Max Switching Voltage | 400 VAC |
| Contact Material | Silver Tin Oxide (AgSnO₂) |
| Minimum Contact Load | 5 V / 10 mA |
| Initial Contact Resistance | ≤ 100 mΩ @ 1 A, 24 VDC |
Mechanical & Environmental
| Operating Temperature | -25 °C to +70 °C |
| Dimensions | 40 mm (L) * 13 mm (W) * 16.5 mm (H) |
| Termination | Through-hole (PCB pin) mounting |
| Insulation | 4 kV RMS (coil-contacts), 2.5 kV RMS (contact-contact) |
Typical Applications
Designed for safety-critical control systems requiring reliable, fail-safe operation:
Industrial Machinery & Automation
Emergency stop circuits, press control systems, machine safety guards, and door interlock monitoring
Elevators & Escalators
Safety control for door interlocks, emergency braking, overload protection, and emergency stop circuits
Safety Systems & Control Panels
Safety relay modules, two-hand control systems, light curtain interfacing, and safety sensor integration
Other Safety Applications
Packaging machinery, material handling equipment, medical equipment safety circuits
Key Advantages
- Safety Compliance: Meets international safety standards for force-guided relays in machinery safety designs
- Reliability: AgSnO₂ contacts provide long electrical life and stable performance under arcing conditions
- Compact Size: Space-efficient PCB-mount form factor for control panel integration
- Versatility: 4-pole configuration (2NO+2NC) supports complex safety logic and redundant switching
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