Superior Electric 5MD136B-2 Powerstat Variable Auto Transformer

The Superior Electric 5MD136B-2 Powerstat Variable Auto Transformer is a POWERSTAT® single‑phase variable autotransformer in the 136B family that accepts 120 VAC line input and provides a continuously adjustable output from 0 to 120 VAC, with a maximum current rating of 22 A in constant‑current operation and 28 A in constant‑impedance operation. The unit uses a carbon brush and commutator arrangement designed for long life, with brushes that require infrequent replacement, and it supports operation at 50/60 Hz. Available in manual and motor‑driven configurations across the POWERSTAT line, the 136B series delivers minimal output voltage variation from no‑load to full‑load, making it suitable for laboratory voltage regulation, test setups, and other applications where precise, controllable voltage is required. With its capability to handle steady regulation under varying loads, the 5MD136B‑2 is a practical choice for bench power tasks, motor control experiments, and calibration work that depend on stable, adjustable AC voltage.