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2 separate monostable relays with each 2 double-pole double-throw. The relays have no limit switch, nevertheless they can be driven with steady continous current. The control takes place by negative switch impulses resp. steady continous current, AC voltage or digital current. Due to internal electronics the relay is noiseless even by connection to digital circuits or pulsed signals. It is intended for train control for the semaphore home signal item 4702 with its 3 terms and for the frog polarization with the switching and turnout decoder item 5280. Power input approx. 2 x 14 mA by 16 V. Contact load max. 2 A each changeover contact.