Allen-Bradley Guardmaster Parts
Safety • 30 parts available
Safety controllers, relays, and Guard I/O protect people and equipment. Listings include Guardmaster and related safety products.
Best-selling Guardmaster parts
All best-selling parts →The Guardmaster part numbers NJT Automation sells most often, ranked by lifetime units sold.
| Part Number | Description | Price | |
|---|---|---|---|
| 440R-B23020 | Safety Relay 3 NO 1 NC 24V AC/DC | — | |
| 440R-C23139 | Safety Relay 3 NO 2 NC 2 PNP 24V AC/DC | — | |
| 440R-D22R2 | Guardmaster 24V dc Safety Relay - Dual Channel With 2 Safety Contacts, 1 Auxiliary Contact | — | |
| 440R-D23117 | Allen Bradley 440R-D23117 | — | |
| 440R-D23118 | Allen Bradley 440R-D23118 | — | |
| 440R-D23127 | Allen Bradley 440R-D23127 | — | |
| 440R-D23128 | Allen Bradley 440R-D23128 | — | |
| 440R-E21358 | Rockwell Automation - 440R-E21358 | — | |
| 440R-E23191 | Electronic Timer Safety Relay 4 NO 2 NC 24V AC/DC | — | |
| 440R-G23110 | Rockwell Automation - 440R-G23110 | — | |
| 440R-G23211 | Allen Bradley 440R-G23211 | — | |
| 440R-G23212 | Allen Bradley 440R-G23212 | — | |
| 440R-G23222 | Allen Bradley 440R-G23222 | — | |
| 440R-G23232 | Allen Bradley 440R-G23232 | — | |
| 440R-H23180 | Rockwell Automation - 440R-H23180 | — | |
| 440R-M23088 | Safety Relay 2 NO and 2 NO delay 1 NC 24V AC/DC | — | |
| 440R-M23090 | Safety Relay 2 NO and 2 NO delay 1 NC 115V AC | — | |
| 440R-M23143 | Safety Relay 2 NO and 3 NO delay 24V AC/DC | — | |
| 440R-N23126 | Safety Relay 3 NO 1 NC 24V AC/DC | — | |
| 440R-N23132 | Safety Relay 3 NO 1 NC 24V AC/DC | — | |
| 440R-N23135 | Minotaur, MSR127RP, 24V Ac/dc, 3 No + 1 Nc, 22.5MM | — | |
| 440R-N23142 | Allen Bradley 440R-N23142 | — | |
| 440R-N23152 | Safety Relay Module | — | |
| 440R-S13R2 | Safety Relay - 24 V dc Dual Channel With 3 Safety Contacts 1 Auxiliary Contact | — | |
| 440R-W23218 | Expansion Relay 2 PNP Solid State 24V DC | — | |
| 440R-W23221 | Expansion Relay 3 N.O 1 N.C 24V DC | — | |
| 440R-ZBE820AZ1 | Expansion Relay 8 NO 2 NC 24V AC/DC 120V AC | — | |
| 440R-ZBE820AZ2 | Rockwell Automation - 440R-ZBE820AZ2 | — | |
| 440R-ZBL220Z24 | Rockwell Automation - 440R-ZBL220Z24 | — | |
| 440R-ZBR520AZ1 | Safety Relay 5 NO 2 NC 24V AC/DC 120V AC | — |
Guardmaster buying & repair guidance
When ordering or requesting a quote, include the full catalog string from the unit's nameplate. Series and revision letters affect fit, firmware, and application compatibility.
Common Guardmaster failures
- Relay contact wear and welded contacts
- Safety input faults from wiring or device mismatch
- Configuration errors after module replacement
- Age-related drift on safety relays
Series & revision differences
Safety substitutions must preserve the safety function and SIL/PL rating. Do not mix incompatible GuardLogix or Guardmaster families without an engineering review.
Repair or replace?
Replace when safety standards or risk assessments require a newer architecture. Repair may be appropriate for discrete Guardmaster relays with clear electromechanical faults.
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