Catalogue → Allen-Bradley → Guardmaster safety relay (440R)
440R-EM4R2
Allen-Bradley · Safety device · Guardmaster safety relay (440R) confirmed
The Allen-Bradley 440R-EM4R2 is a safety device in the Guardmaster safety relay (440R) range. EM expansion module, 4 N.O.
What 440R-EM4R2 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.
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| Manufacturer | Allen-Bradley (also Rockwell Automation, AB) |
|---|---|
| Family | Guardmaster safety relay (440R) |
| Category | Safety device |
| Without separators | 440REM4R2 |
| Notes | EM expansion module, 4 N.O.; verified: Rockwell 440r-sg001 Next Generation Guardmaster Safety Relays Selection Guide |
What changes what 440R-EM4R2 is worth
Same catalogue number, different money. These are the attributes that separate two otherwise identical 440R-EM4R2 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-EM4R2?
The Allen-Bradley 440R-EM4R2 is a safety device in the Guardmaster safety relay (440R) range. EM expansion module, 4 N.O.
What changes what a 440R-EM4R2 is worth?
Two 440R-EM4R2 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-EM4R2?
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-EM4R2?
Allen-Bradley makes the 440R-EM4R2. The same equipment is sold and labelled as AB, A-B, Allen Bradley, Allen-Bradley, Rockwell, Rockwell Automation.