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www.siemens.com.au/rail-components Relay Style QBBA1 Twin Dc-Biased Ac-Immune Relay Use in Ac-Electrified Territory Immune to false operation from induced ac voltages, making it a relay of choice in ac-electrified territory. Dc-Biased QBBA1 relays operate on normal voltage polarity only. Connect two relays with opposite polarity for two-wire detection block and similar circuits. Bias levels are maintained even with reasonable levels of forward and reverse overvoltage. Benefits Ac-immune Two electrically-independent relays mounted on one base Application Performs like a QBA1 relay while saving space in a twin package. Operates on single-polarity dc Used for dual-polarity detection and block circuits Complies with BR specification 961 Datasheet 3E-2 Datasheet 3E-2 Description Specifications A twin single-wound dc-biased acimmune relay, compliant with BR Specification 961. Specifications apply at a coil temperature of 20°C. Two electrically-independent relays mounted side by side on a single base. Each of the twin relays can operate a maximum of eight pairs of contacts. Ordering Please use part numbers from this datasheet or our product catalogue, or contact Siemens to discuss your requirements with our Sales staff. Part number Nominal working volts Contacts M25101 50 M25102 50 M25104 issue 4.0 Coil resistance (ohms) Maximum full operating volts Minimum release volts Plugboard Part number Code holes 2 x 6F2B 1100 40 7.5 M23650 ABFHJ 2 x 4F4B 1100 40 7.5 M23451 ABCEH 24 2 x 6F2B 240 19.2 3.6 M23651 ACEGK M25105 24 2 x 4F4B 240 19.2 3.6 M23652 ACEFK M25131 12 2 x 6F2B 65 9.6 1.8 M25485 BEFGX M25132 12 2 x 4F4B 65 9.6 1.8 M25484 ABDKS Contact rating 3 A continuous or 3 BR930A relays Power consumption Less than 3 W Reverse polarity Less than 20 times rated voltage AC immunised 12 V relay 500 Vac 24 V relay 1000 Vac 50 V relay 1000 Vac Reverse dc immunity 24 V relay 480 Vdc 50 V relay 1000 Vdc Voltage withstand 20 x rated V results in < 10% change in relay characteristics Layout of Contacts (Rear View) F = Front contact, B = Back contact A 1 2 3 4 5 6 7 8 R1 R3 B C D F F F F F F F F B F F B B F F B C C C C RH Relay 6F 2B LH Relay 6F 2B 1 2 3 4 5 6 7 8 R2 R4 A B C D F F F F F F F F B B B B B B B B C C RH Relay 4F 4B C C LH Relay 4F 4B Siemens Rail Automation Pty Ltd ABN 78 800 102 483 Level 7, 380 Docklands Drive, Docklands, Victoria 3008, Australia T +61 1300 724 518 E [email protected] W www.siemens.com.au/rail-components © 2014, Siemens Rail Automation Pty Ltd