Unique-Bargains 4 Ohm 5% 100W Wire Wound Resistor 2pcs

4 Ohm 100 W wire-wound resistor pair

This two-piece set supplies a 4 Ω resistance value with a 100 W power rating and 5 % tolerance. The aluminum-housed chassis-mount body measures 59 x 15 mm and includes 1.8 mm and 3 mm mounting holes for direct attachment to a metal plate. It is intended for industrial power, transducer, elevator and similar high-demand equipment where stable load handling is required.

Thermal limits of the aluminum chassis mount

The resistor converts electrical energy into heat and becomes extremely hot during operation; direct contact must be avoided. Mounting on a metal board is mandatory, and the supplier advises a 30 % to 50 % power derating with an added heat sink depending on the actual load. Without proper heat sinking the component cannot sustain its rated dissipation safely.

Replaces lower-power or non-chassis resistors

Builders moving from smaller axial or radial wire-wound parts that lack an integrated aluminum shell gain a rugged, vibration-resistant package with standardised mounting centres. The jump is worthwhile when the application demands 100 W continuous dissipation, secure chassis mounting and the 59 mm body length fits the available space. It is not suited for automotive repair or modification without professional expertise.