Catalogue → Allen-Bradley → Guardmaster safety relay (440R)
440R-M23144
Allen-Bradley · Safety device · Guardmaster safety relay (440R) confirmed
The Allen-Bradley 440R-M23144 is a safety device in the Guardmaster safety relay (440R) range. MSR138DP single-function safety relay with delayed outputs.
What 440R-M23144 sells for
No auction result recorded for this part yet. We publish hammer prices only where we have watched a lot through to close — never an estimate in their place.
See 440R-M23144 listed on eBay → Asking prices, not sold prices. We may earn a commission.
| Manufacturer | Allen-Bradley (also Rockwell Automation, AB) |
|---|---|
| Family | Guardmaster safety relay (440R) |
| Category | Safety device |
| Without separators | 440RM23144 |
| Notes | MSR138DP single-function safety relay with delayed outputs; verified: Rockwell 440r-td001 Minotaur Safety Relay (MSR) Specifications |
What changes what 440R-M23144 is worth
Same catalogue number, different money. These are the attributes that separate two otherwise identical 440R-M23144 units — check each one before you quote or bid.
Series letter
Series letter on the label. Later series are not always backward compatible and sell for more.
Printed on the label, usually right after the catalogue number, as "SER A".
Firmware revision
Firmware/FRN revision. Buyers match it to an existing project; a mismatch can make the unit useless to them.
On the label as "FRN" or "FW", and on the module's own display if it powers up.
Tested or untested
Tested / as-is / new-in-box. The single biggest multiplier on used price.
Not on the plate. It comes from whoever pulled the unit, and it moves the price more than anything printed.
Questions
What is a 440R-M23144?
The Allen-Bradley 440R-M23144 is a safety device in the Guardmaster safety relay (440R) range. MSR138DP single-function safety relay with delayed outputs.
What changes what a 440R-M23144 is worth?
Two 440R-M23144 units with the same catalogue number can be worth different amounts. What separates them: series letter, firmware revision, tested or untested. Series letter on the label. Later series are not always backward compatible and sell for more. Firmware/FRN revision. Buyers match it to an existing project; a mismatch can make the unit useless to them. Tested / as-is / new-in-box. The single biggest multiplier on used price.
Where do you find the series or revision on a 440R-M23144?
Series letter: Printed on the label, usually right after the catalogue number, as "SER A". Firmware revision: On the label as "FRN" or "FW", and on the module's own display if it powers up. Tested or untested: Not on the plate. It comes from whoever pulled the unit, and it moves the price more than anything printed.
Who makes the 440R-M23144?
Allen-Bradley makes the 440R-M23144. The same equipment is sold and labelled as AB, A-B, Allen Bradley, Allen-Bradley, Rockwell, Rockwell Automation.