Contactor,circuit breaker,solar inverter,electric meter,solar batteries
(Standard Format: 440R-B23020/C)
Core Description
This is a safety monitoring relay from the Allen-Bradley (Rockwell Automation) Guardmaster Minotaur MSR5T Series, Series C version. It is intended for low-risk safety applications in industrial automation systems, such as safety gate monitoring and emergency stop button control.
1 Complete Model Breakdown
| Model Segment | Standard Format | Description |
| 440R | 440R | Product family identifier for Rockwell Automation Bulletin 440R safety relays, part of the Guardmaster safety product range |
| B | -B | Subseries code, representing the MSR5T Series (Minotaur Safety Relay Type 5T monitoring safety relay) |
| 23020 | 23020 | Function and configuration code, detailed as follows: |
| – 2: Supply type (universal 24V AC/DC power supply) | ||
| – 3: Number of safety outputs (3 normally open NO safety outputs) | ||
| – 0: Auxiliary output type (1 normally closed NC auxiliary output) | ||
| – 2: Input configuration (1 normally closed NC single‑channel input, for safety gate interlocks and E‑stop buttons) | ||
| – 0: Reset type (selectable automatic / manual reset via jumper) | ||
| C | /C | Series version code, indicating Series C, the latest production version with firmware updates and performance improvements |
2 Detailed Explanation of Each Code
- 440R – Product Family Identifier
440: Standard prefix for Rockwell Automation safety products, dedicated to the Guardmaster safety relay line
R: Abbreviation for Relay, defining the product as a safety relay, distinguishing it from other 440-series devices such as safety switches (440G) and safety controllers (440C)
- B – Subseries Code (MSR5T)
B Corresponds exclusively to the Minotaur MSR5T model, a monitoring safety relay with key features:
Single-or dual-channel input (this model uses 1NC single-channel input)
3 independent redundant normally open safety outputs to ensure reliable safety function
1 normally closed auxiliary output for status feedback signals
Supports output monitoring to detect faults in the safety output circuit
- 23020 – Detailed Function Configuration Code
| Digit | Meaning | Value in This Model | Specification |
| 1st digit (2) | Supply type | 2 | Universal 24V AC/DC power supply, wide‑range design for various control systems |
| 2nd digit (3) | Number of safety outputs | 3 | 3 normally open (NO) safety outputs for direct control of contactors or actuators |
| 3rd digit (0) | Auxiliary output type | 0 | 1 normally closed (NC) auxiliary output for PLC status feedback or indicator control |
| 4th digit (2) | Input configuration | 2 | 1 normally closed (NC) single‑channel input for low‑risk applications |
| 5th digit (0) | Reset type | 0 | Selectable automatic / manual reset via jumper on terminals X1‑X2 |
- C – Series Version Code
C Indicates the product is Series C, the latest production version
Version differences:
Series A: Original version
Series B: Improved version with partial functional optimizations
Series C: Latest version with firmware updates, performance enhancements, and compatibility improvements
All series versions are fully functionally compatible and can be directly interchanged
3 Key Technical Parameters (for 440R-B23020/C)
| Parameter | Specification |
| Product Type | Minotaur MSR5T safety monitoring relay |
| Safety Rating | Category 4, PLe (ISO 13849‑1), SIL 3 (IEC 61508), Stop Category 0 |
| Input Configuration | 1 normally closed (NC) single‑channel input, suitable for safety gate interlocks and emergency stop buttons |
| Output Configuration | 3 normally open (NO) safety outputs + 1 normally closed (NC) auxiliary output |
| Supply Voltage | 24V AC/DC (universal power supply) |
| Reset Method | Automatic / manual reset (selectable via jumper) |
| Mounting | DIN rail mounting (EN 60715 compliant), width 22.5 mm |
| Protection Degree | IP20 (front) |
| Operating Temperature | -25 °C to +60 °C |
4 Application Areas & Selection Guidelines
Typical Applications
Safety gate monitoring (low-risk applications)
Emergency stop button control
Safety circuit monitoring for small machinery
Key Selection Points
Confirm input type: ensure single-channel 1NC input meets safety device connection requirements
Check output quantity: verify 3 NO safety outputs + 1 NC auxiliary output satisfy control circuit demands
Verify supply compatibility: confirm 24V AC/DC universal power matches system voltage
Version selection: Series C is the latest version and recommended for priority use
