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The Behlman RR1200 Series Railroad Signal Source delivers a regulated sinewave output of 120 VAC at a fixed frequency of 50, 60, 100, 200 or 250 Hz, plus/minus 1 percent in a 3-1/2-inch high chassis. The unit can be bench or shelf mounted or installed in a 19-inch rack mount cabinet. Input is 120 VAC, single phase, 45-253 Hz. Protective circuits include fuse with surge arrestor and lightning protection, overload and thermal protection. The RR 1200 Railroad Signal Source is designed for use in bungalows as well as relay shops. Other models available from 1200VA to 120KVA.