HSP121BT-1RU Installation
Installation Instructions
- Remove power from equipment to be protected.
- Mount Edco HSP121BT Series in a UL approved housing. Keep all leads as short as possible (less than 3 feet).
- Position unit within the equipment cabinet so that the fuse holder will be accessible should the fuse need replacing.
- Secure HSP using up to six screws to fit 3/16″ hole openings. Use sheet metal or wood screws depending on the mounting surface.
- Make sure wiring from power sources properly connects to LINE side of HSP (torque to 7 in. lbs.). Wiring from protected equipment must properly connect to EQUIP side of HSP (torque to 7 in. lbs.).
- Indication of internal failure: a. Indicator will extinguish. b. Fuse blown will disconnect load from power source.
- Connect only to 120 VAC, 15 Amp Max., single phase, three wire circuit.
WARNING: Disconnect AC source before replacing fuse. For continued protection against risk of fire, replace only with same type rating of fuse (3AB, 15A/250V).

See additional details on the HSP121BT-1RU product page.
Questions about installation or selection? Talk to a licensed electrician: 941-355-8822 (Mon–Fri 8–5 EST), or request a quote.