York S1-FRSR40 Fuse

In the field, reliability is non-negotiable, and the York S1-FRSR40 Fuse is a staple for protecting critical HVACR motor circuits. This 40A 600V Fusetron Buss Fuse is a Class RK5 dual-element time-delay fuse, engineered to handle the high inrush currents typical of compressor and fan motor startups while providing superior short-circuit protection with a 200kA interrupting rating. By utilizing dual-element construction, the S1-FRSR40 maintains a 10-second minimum opening time at 500% of the ampere rating, which effectively prevents nuisance tripping due to temporary surges. This current-limiting fuse is a direct OEM replacement part for York equipment and Eaton Bussmann applications requiring 600Vac/250Vdc protection. Its fiberglass body and ferrule ends ensure a secure fit and durable performance in demanding industrial and electrical fuse environments. For contractors, the York S1-FRSR40 is the go-to choice for ensuring motor overload protection and system longevity in rooftop units and commercial air handlers.

• Dual-element time-delay technology facilitates closer sizing for enhanced motor and transformer protection.
• High 200kA interrupting rating provides robust safety against severe fault currents.
• Current-limiting performance significantly reduces thermal and magnetic stress on downstream components.
• Class RK5 rejection feature prevents the installation of lower-rated fuses in high-capacity circuits.
• Versatile voltage rating handles up to 600Vac and 250Vdc for diverse field applications.

Can I use an S1-FRSR40 in a 250V circuit?
Yes, while rated for 600V, this dual-element fuse is fully rated for DC applications up to 250V and AC applications up to 600V.

Is the S1-FRSR40 a direct replacement for an FRN-R-40?
No. The FRN-R series is a 250V Class RK5 fuse. The S1-FRSR40 is a 600V rated fuse and is physically longer, meaning it will not fit in a 250V-only fuse block.

How does "time-delay" help with HVAC startups?
It allows the fuse to withstand high inrush currents during motor startup without opening, whereas fast-acting fuses might blow during a standard equipment cycle.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.