RN-100AM load rheostat

The RN-100AM is a load rheostat providing smooth stepped adjustment of 50 Hz AC or DC current for testing relay protection, circuit breakers and measuring instruments. At 220 V the adjustment range is 1.4–105 A; it has nineteen 40-ohm steps, a 120-ohm sliding rheostat and an overall 2.1–160-ohm range. Full-load operation is limited to 3 minutes followed by at least 15 minutes cooling; dimensions are up to 560 × 470 × 370 mm and mass about 23 kg. Available documentation does not establish a unique manufacturer.