440R-D23171
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Overview of Allen Bradley 440R-D23171
The Allen Bradley 440R-D23171 is a high-performance MSR125HP safety relay designed for two-hand control applications requiring reliable safety monitoring. Operating at 24V DC, this single-function safety relay features two normally open (N.O.) safety outputs with immediate response, suitable for ensuring personnel protection in industrial environments. Its slim design allows easy rail mounting, making it a compact yet robust option for safety control circuits involving light curtains, interlock switches, safety mats, and emergency stop functions. Rated for a high safety category and performance level, it supports applications demanding compliance with stringent safety standards such as ISO 13849 and IEC 61508, offering dependable operation over 2 million cycles. With automatic/manual reset and removable terminals, it combines user convenience with industrial-grade dependability.Key Features of Allen Bradley 440R-D23171
- Two-hand control safety relay with 24V DC power supply
- Two immediate safety outputs (2 N.O.) for precise safety control
- Safety category 4 and performance level e compliance according to EN ISO 13849-1
- SIL 3 rating conforming to IEC 61508 ensures high reliability
- Compact dimensions: 99 mm height, 22.5 mm width, 114.5 mm depth suitable for DIN rail mounting
- Rated operation current up to 8 A (6 A at AC-15 230 V, 3 A at DC-13 24 V)
- Automatic and manual reset option for flexible control
- Removable screw terminals for easy wiring and maintenance
- IP40 enclosure protection with IP20 rated terminals
- High resistance to shock (10 g) and vibration (0.35 mm displacement) for industrial use
Technical Specs of 440R-D23171
| Specification | Value |
|---|---|
| Power Supply | 24 V DC |
| Safety Outputs | 2 Normally Open (N.O.) Immediate |
| Rated Operation Current (Ie) | 8 A (6 A AC-15 230 V, 3 A DC-13 24 V) |
| Safety Category | Category 4 (EN ISO 13849-1) |
| SIL Rating | SIL 3 (IEC 61508) |
| Mounting | DIN Rail |
| Dimensions (H x W x D) | 99 mm x 22.5 mm x 114.5 mm |
| Weight | 0.46 kg |
| Reset | Automatic/Manual |
| IP Rating | IP40 Enclosure, IP20 Terminals |
| Shock Resistance | 10 g |
| Vibration Frequency (Operational) | Up to 55 Hz |
Applications / Use Case
The Allen Bradley 440R-D23171 safety relay is ideal for safeguarding machines and operators in various industrial settings. It is commonly used to implement two-hand control systems that require both hands of an operator for safe machine start-up to prevent accidental injury. Typical applications include integration with light curtains, safety mats, laser scanners, and interlocking devices in automation lines. The unit’s reliable safety outputs make it suitable for controlling emergency stops and enabling devices to meet strict safety regulations. This relay’s compact size and DIN rail compatibility enable easy incorporation into existing control panels in automotive manufacturing, packaging, material handling, and general machinery safety applications that demand high functional safety integrity.Related Resources
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