Modern homes need layered protection for AC systems and electronics. Masfrio’s AC disconnect switches, MAR time‑delay fuses, and SP50 surge protectors work together to prevent hazards, avoid nuisance trips, and shield against surges—safe, compatible, and built for residential use.

What Each Component Does

• AC Disconnect Switch: Safe, lockable power cutoff for HVAC maintenance without whole‑home shutdown. Visible break for safer service.

• MAR Time‑Delay Fuse: Tolerates AC startup inrush; stops dangerous overloads and short circuits. Prevents false trips and fire risks.

• SP50 SPD: Diverts lightning and grid surges to ground. Protects AC boards and sensitive home electronics 24/7.

Sizing & Compatibility Guide

  1. MAR Fuse by AC Size

• 1–3 ton: 30A MAR time‑delay fuse (250VAC)

• 4–5 ton: 60A MAR time‑delay fuse (250VAC)

  2. Disconnect Switch Match: Use same current rating as fuse (30A switch ↔ 30A fuse; 60A switch ↔ 60A fuse).

SP50 SPD: 250VAC universal fit. Install before disconnect and fuse; ensure proper grounding.

Installation & Maintenance

  1. Have a licensed electrician install.

  2. Order: Main Power → SP50 SPD → Disconnect Switch → MAR Fuse → AC Unit.

  3. Check connections monthly. Replace fuses only with identical 30A/60A 250VAC time‑delay types.

  4. Replace SP50 every 3–5 years or after major storms.

Why This Kit Matters

This integrated system cuts AC downtime, lowers repair costs, reduces fire and surge risks, and keeps your family and devices safe. Engineered for seamless compatibility, it’s ideal for new installs, renovations, and AC safety upgrades.

Masfrio residential electrical components | UL listed | engineered for home AC circuit protection