SELCO T4500.0090 Auto Synchronizer

SELCO T4500.0090 Auto Synchronizer is a compact, DIN-rail or screw‑mountable control module that automatically synchronizes a 120/127V generator to a live bus bar, with a 0–2% delta‑voltage window for this variant. It continuously monitors bus and generator voltage and frequency, using two built‑in relays to deliver increase/decrease pulses to a conventional governor, and issues a breaker‑closing signal just before the circuit breaker make time once frequency and phase are within limits. Features include automatic voltage matching, adjustable delta frequency from 0.1 Hz to 1.0 Hz, adjustable breaker make time, a 50‑hour burn‑in before final test, and flame‑retardant enclosure with certification from major classification societies for marine use. Weighing about 2 lb and measuring 9 × 9 × 9 in, it fits a compact footprint; the T4500 family covers multiple voltages (e.g., 400/450V, 230V, 415/480V, 600V), and the 0090 version is specified for 120/127V service with positive delta volt 0–2%, with compatibility to conventional governors via devices like the E7800 Motorized Potentiometer or T7900 Electronic Potentiometer for signaling to electronic speed controllers.