Catalogue → Allen-Bradley → Guardmaster trapped key interlock (440T)

440T-AACA21

Allen-Bradley · Safety device · Guardmaster trapped key interlock (440T) confirmed

The Allen-Bradley 440T-AACA21 is a safety device in the Guardmaster trapped key interlock (440T) range. Prosafe rotary switch accessory.

What 440T-AACA21 sells for

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Manufacturer	Allen-Bradley (also Rockwell Automation, AB)
Family	Guardmaster trapped key interlock (440T)
Category	Safety device
Without separators	`440TAACA21`
Notes	Prosafe rotary switch accessory; verified: Rockwell switch-td001 Safety Switches Specifications

What changes what 440T-AACA21 is worth

Same catalogue number, different money. These are the attributes that separate two otherwise identical 440T-AACA21 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".

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 440T-AACA21?

The Allen-Bradley 440T-AACA21 is a safety device in the Guardmaster trapped key interlock (440T) range. Prosafe rotary switch accessory.

What changes what a 440T-AACA21 is worth?

Two 440T-AACA21 units with the same catalogue number can be worth different amounts. What separates them: series letter, tested or untested. Series letter on the label. Later series are not always backward compatible and sell for more. Tested / as-is / new-in-box. The single biggest multiplier on used price.

Where do you find the series or revision on a 440T-AACA21?

Series letter: Printed on the label, usually right after the catalogue number, as "SER A". 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 440T-AACA21?

Allen-Bradley makes the 440T-AACA21. The same equipment is sold and labelled as AB, A-B, Allen Bradley, Allen-Bradley, Rockwell, Rockwell Automation.

Others in Guardmaster trapped key interlock (440T)

See the whole Guardmaster trapped key interlock (440T) family →