Siemens 42DF35AJ 3-Pole Definite Purpose Contactor

Siemens 42DF35AJ is a 3-pole, non-reversing definite‑purpose contactor from the 42DP family, designed to switch and control heavier loads in equipment such as HVAC systems and pumps. It uses a 24 V AC coil to energize three power contacts rated at 50 A, enabling reliable control of motors and compressors with a compact footprint. This open‑type unit measures 4.04 × 2.87 × 3.11 inches and weighs about 1.59 lb, making it suitable for base-mounted or panel-mounted installations in commercial control panels. The 42DF35AJ is intended for definite‑purpose (UL Class 42) service and is commonly wired with quick‑connect terminals on the power side for efficient field wiring. Typical applications include air-handling equipment, condensate pumps, circulating pumps, and fan controllers where a dedicated, 3‑pole control device is required to manage a 50 A load with a 24 V control signal. As part of Siemens Furnas’ 42DP product line, it provides solid, purpose‑built performance for OEM equipment substitutions and retrofit projects, offering the reliability of a well‑established industry standard in a compact 3‑pole form factor.