Product Description
Siemens 3RH2122-1BW40 10 AMP AC control relay with 2 normally open and 2 normally closed contacts and a 48 volt DC coil. This Sirius 4-pole control relay can be outfitted with additional 4 pole auxiliary contact blocks in all contact arrangements (4 N.O. , 3 N.O./1 N.C., 2 N.O./2 N.C., 1 N.O./3 N.C., 4 N.C.) for a total of 8 operating poles. This relay is a direct electrical and physical replacement for the obsolete 3RH1122-1BW40 though any existing 3RH1911 auxiliaries, varistors, RC elements or diodes would also need to be replaced as they will not mount to this new style 3RH2122-1BW40 Siemens relay.
| Coil voltage | 48 volt DC |
| AMP rating | 10 AMP |
| Number of Poles | 4 |
| Pole arrangement |
2 normally open 2 normally closed |
Click here to view a datasheet on this Siemens 3RH2 Control Relay
The 3RH2 contactor relays are suitable for use in any climate. They are finger-safe according to EN 50274. The devices with ring lug terminal connection comply with degree of protection IP20 when fitted with the related terminal cover.
The 3RH2 contactor relays can be expanded by up to four contacts by the addition of snap-on auxiliary switch blocks. The auxiliary switch block can easily be snapped onto the front of the contactors. The auxiliary switch block has a centrally positioned release lever for disassembly. The contactor relays with 4 contacts according to EN 50011, with the identification number 40E, can be extended with 80E to 44E auxiliary switch blocks to obtain contactor relays with 8 contacts according to EN 50011. These auxiliary switch blocks (3RH29 11–1GA..) cannot be combined with contactor relays with identification numbers 31E and 22E.
