Based on the available information, it is speculated that Allen - Bradley AB 440R - S32021 may be a product of the Guardmaster series of safety relays.
The parameters of Allen - Bradley AB 440N - S32021 are as follows:
Manufacturer: Allen - Bradley/Rockwell
Catalog Number: 440N - S32021
Power Supply: 24V AC/DC & 110/230V AC
Contact Rating: 2 amps
Enclosure Width: 45 mm
Input: One Sipha input
Output: 2 safety outputs, 1 N.C. relay output, 1 N.C. aux. relay output
Reset Mode: Automatic/manual
Standards: CCC, CE, CUL, KC, UL
Type: Sipha control unit