TRS40R

The Mersen TRS40R is part of the TRS‑R (Tri‑Onic®) Class RK5 time‑delay fuse series, engineered to provide reliable overcurrent and short‑circuit protection in low‑voltage electrical systems up to 600 VAC and 600 VDC. Designed as a dual‑element current‑limiting fuse, it effectively handles inrush currents associated with motor starting and transformer energizing without nuisance openings, while still offering robust fault interruption. The TRS‑R fuses are UL 248‑12 and CSA C22.2 listed, reflecting adherence to North American safety and performance standards for power fuses.

The TRS40R is rated at 40  A continuous current with a high interrupting capacity (e.g., 200kA@600V and a significant DC interrupting rating), enabling it to safely clear severe fault conditions typical in industrial feeder, motor, and transformer circuits. The current‑limiting design minimizes let‑through energy during fault interruption, reducing stress on conductors and downstream equipment and improving coordination with upstream circuit protection. The time‑delay characteristic permits brief overload surges (such as motor starts or transformer inrush) without immediate blowing, making it well‑suited for circuits with frequent transient currents.

Mechanically, TRS‑R fuses like the TRS40R feature a rugged construction with a fiberglass body and high‑grade silica filler that supports fast arc quenching and dimensional stability in harsh environments. They are typically designed with blade or rejection‑style ends to fit into compatible fuse blocks or holders, helping prevent incorrect replacements when used with the appropriate mounting accessories. TRS‑R fuses find application in motor protection, feeder circuits, service entrance equipment, general‑purpose branch circuits, and transformer circuits across industrial, commercial, and utility installations where reliable, time‑delay overcurrent protection is critical.

Purchase the TRS40R at Electrical.com, your reliable partner for industrial and commercial electrical products. Our selection includes fuses from manufacturers like Mersen and Ferraz Shawmut, backed by a dedicated sales team ready to assist with technical questions, product selection, and support.