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3RR2 Monitoring Relays

Siemens 3RR2 Monitoring Relays are designed for continuous supervision of motor currents and load conditions in industrial control panels. These relays are mounted directly onto RT2 contactors for compact motor starter assemblies. The 3RR2 monitoring relays detect various faults, including overcurrent, undercurrent, phase failure, cable breaks, current asymmetry, and blocked‑rotor conditions, to prevent machine damage and reduce downtime. These relays are available in three sizes: S00, S0, and S2. The 3RR2 monitoring relays are conceived for monitoring 3-phase systems.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (GBP) Filter the results in the table by unit price based on your quantity.	Qty.
Industrial Relays CURRENT MONITOR S2 24VUC 8-80A SPRING 3RR21433AA30 Siemens 1: £330.01 3In Stock	Mfr. Part No. 3RR21433AA30 Mouser Part No 982-3RR21433AA30	Siemens	Industrial Relays CURRENT MONITOR S2 24VUC 8-80A SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	3In Stock	£330.01 £298.94 £294.71	Min.: 1 Mult.: 1
Industrial Relays CURR MON IO-LINK S0 4-40A 24VDC SCREW 3RR24421AA40 Siemens 1: £553.42 3In Stock	Mfr. Part No. 3RR24421AA40 Mouser Part No 982-3RR24421AA40	Siemens	Industrial Relays CURR MON IO-LINK S0 4-40A 24VDC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	3In Stock	£553.42 £523.51	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SCREW 3RR21411AA30 Siemens 1: £190.34 Non-Stocked Lead-Time 3 Weeks	Mfr. Part No. 3RR21411AA30 Mouser Part No 982-3RR21411AA30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 3 Weeks	£190.34 £180.91 £177.59	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SCW 3RR21411AW30 Siemens 1: £213.37 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21411AW30 Mouser Part No 982-3RR21411AW30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SCW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£213.37 £202.96 £200.12	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SPRING 3RR21412AA30 Siemens 1: £190.34 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21412AA30 Mouser Part No 982-3RR21412AA30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£190.34 £180.91 £177.59	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SPG 3RR21412AW30 Siemens 1: £213.37 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21412AW30 Mouser Part No 982-3RR21412AW30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SPG Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£213.37 £202.96 £200.12	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24VUC SCREW 3RR21421AA30 Siemens 1: £243.65 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21421AA30 Mouser Part No 982-3RR21421AA30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24VUC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£243.65 £230.36 £225.48	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SCREW 3RR21421AW30 Siemens 1: £244.80 Non-Stocked Lead-Time 3 Weeks	Mfr. Part No. 3RR21421AW30 Mouser Part No 982-3RR21421AW30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 3 Weeks	£244.80 £233.84 £230.62	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24VUC SPRING 3RR21422AA30 Siemens 1: £225.80 Non-Stocked Lead-Time 3 Weeks	Mfr. Part No. 3RR21422AA30 Mouser Part No 982-3RR21422AA30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24VUC SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 3 Weeks	£225.80 £214.76 £211.75	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SPRING 3RR21422AW30 Siemens 1: £244.80 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21422AW30 Mouser Part No 982-3RR21422AW30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£244.80 £233.84 £230.62	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITOR S2 24VUC 8-80A SCREW 3RR21431AA30 Siemens 1: £310.09 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21431AA30 Mouser Part No 982-3RR21431AA30	Siemens	Industrial Relays CURRENT MONITOR S2 24VUC 8-80A SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£310.09 £298.94 £294.86	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITOR S2 24-240VUC 8-80A SCREW 3RR21431AW30 Siemens 1: £334.55 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21431AW30 Mouser Part No 982-3RR21431AW30	Siemens	Industrial Relays CURRENT MONITOR S2 24-240VUC 8-80A SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£334.55 £328.12	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITOR S2 250VUC 8-80A SPRING 3RR21433AW30 Siemens 1: £334.55 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR21433AW30 Mouser Part No 982-3RR21433AW30	Siemens	Industrial Relays CURRENT MONITOR S2 250VUC 8-80A SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£334.55 £328.12	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SCREW 3RR22411FA30 Siemens 1: £365.60 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22411FA30 Mouser Part No 982-3RR22411FA30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£365.60 £358.56	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SCW 3RR22411FW30 Siemens 1: £380.78 Non-Stocked Lead-Time 3 Weeks	Mfr. Part No. 3RR22411FW30 Mouser Part No 982-3RR22411FW30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SCW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 3 Weeks	£380.78 £373.43	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SPRING 3RR22412FA30 Siemens 1: £365.60 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22412FA30 Mouser Part No 982-3RR22412FA30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24VUC SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£365.60 £358.56	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SPG 3RR22412FW30 Siemens 1: £380.78 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22412FW30 Mouser Part No 982-3RR22412FW30	Siemens	Industrial Relays CURRENT MONITR S00 1.6-16A 24-240VUC SPG Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£380.78 £373.43	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24VUC SCREW 3RR22421FA30 Siemens 1: £404.50 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22421FA30 Mouser Part No 982-3RR22421FA30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24VUC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£404.50 £396.67	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SCREW 3RR22421FW30 Siemens 1: £428.77 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22421FW30 Mouser Part No 982-3RR22421FW30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£428.77 £420.47	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24VUC SPRING 3RR22422FA30 Siemens 1: £404.50 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22422FA30 Mouser Part No 982-3RR22422FA30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24VUC SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£404.50 £396.67	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SPRING 3RR22422FW30 Siemens 1: £428.77 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22422FW30 Mouser Part No 982-3RR22422FW30	Siemens	Industrial Relays CURRENT MONITR S0 4-40A 24-240VUC SPRING Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£428.77 £420.47	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITOR S2 24VUC 8-80A SCREW 3RR22431FA30 Siemens 1: £520.74 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22431FA30 Mouser Part No 982-3RR22431FA30	Siemens	Industrial Relays CURRENT MONITOR S2 24VUC 8-80A SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£520.74 £502.80	Min.: 1 Mult.: 1
Industrial Relays CURRENT MONITOR S2 24-240VUC 8-80A SCREW 3RR22431FW30 Siemens 1: £550.07 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22431FW30 Mouser Part No 982-3RR22431FW30	Siemens	Industrial Relays CURRENT MONITOR S2 24-240VUC 8-80A SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£550.07 £531.12	Min.: 1 Mult.: 1
Industrial Relays CURR MON IO-LINK S2 24VDC 8-80A SCREW 3RR22433FA30 Siemens 1: £520.74 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22433FA30 Mouser Part No 982-3RR22433FA30	Siemens	Industrial Relays CURR MON IO-LINK S2 24VDC 8-80A SCREW Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£520.74 £502.80	Min.: 1 Mult.: 1
Industrial Relays CURR MON IO-LINK S2 24VDC 8-80A SPRNG 3RR22433FW30 Siemens 1: £550.07 Non-Stocked Lead-Time 2 Weeks	Mfr. Part No. 3RR22433FW30 Mouser Part No 982-3RR22433FW30	Siemens	Industrial Relays CURR MON IO-LINK S2 24VDC 8-80A SPRNG Learn More about Siemens 3rr2 monitoring relays	Datasheet	Non-Stocked Lead-Time 2 Weeks	£550.07 £531.12	Min.: 1 Mult.: 1

3RR2 Monitoring Relays

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