800 Amp Disconnects — Emergency Builds & Same-Day Stock

When an 800 amp disconnect fails on a live service entrance, the plant is down until you have a replacement on the bench. Verified Breakers stocks heavy-duty 800 amp safety switches in fusible and non-fusible configurations across every major brand — Square D, Siemens, Eaton, Cutler Hammer, ABB, and GE — ready to ship inside 24 to 48 hours when factory lead times stretch past 20 weeks.

What an 800 Amp Disconnect Switch Does

An 800 amp disconnect (also called an 800A safety switch, service disconnect, or main disconnect) gives electrical contractors and facility teams a single-throw means of isolating an 800 amp circuit for maintenance, fault clearing, or lockout/tagout compliance under NFPA 70E. At this rating the switch is sized for heavy commercial and industrial service — data center service entrances, manufacturing line feeders, large rooftop HVAC plant, motor control center tie points, and standby generator transfer switching.

The 800 amp class typically supports up to 250 HP at 600 volt AC three-phase, with selected heavy-duty models rated higher for inductive motor loads. Voltage options span 240V, 480V, and 600V three-phase service, with two-pole and three-pole configurations available depending on whether a neutral conductor is required at the disconnect point. Short-circuit withstand and close-on ratings of 200 kA RMS symmetrical are standard at the 800A frame when paired with the correct current-limiting fuse class.

Brand Options We Stock

Verified Breakers carries 800 amp disconnects across every manufacturer specified on modern commercial drawings:

• Square D — H-series and HU-series heavy duty safety switches (H367, H367N, HU367 variants)
• Siemens — HF and HNF series fusible and non-fusible 800A disconnects
• Eaton / Cutler Hammer — DH and DG series, including the DH367FRK fusible and DH367NRK non-fusible safety switches
• ABB — THN3367R non-fusible 3-pole heavy duty and TGN-series alternatives
• GE — TH and TC series industrial disconnects in the 800A frame

If your specification calls for a discontinued or hard-to-source catalog number, our procurement desk will locate the surplus unit, refurbish to OEM tolerances, or build a code-compliant equivalent. Brand cross-references are included on every quote so you can confirm the alternate matches the engineer-of-record submittal.

Enclosure and Environment Options

800 amp safety switches are stocked in the full NEMA enclosure range so the switch matches the install environment without field modification:

• NEMA 1 — indoor general purpose for electrical rooms and switchgear lineups
• NEMA 3R — outdoor, raintight; standard for service-entrance and exterior pad-mount applications
• NEMA 12 — indoor industrial, dust-tight and drip-tight for plant floors and process environments
• NEMA 4X — stainless or non-metallic, washdown rated for food processing, wastewater, and coastal corrosive installs

At the 800A frame size, floor-mount enclosures are common for service-entrance applications where cable bending radius and lug working space drive the enclosure dimensions. Wall-mount configurations are available for downstream feeder isolation points where ceiling height permits.

Fusible vs Non-Fusible 800 Amp Disconnects

Fusible 800 amp disconnects accept Class L current-limiting fuses, providing both isolation and overcurrent protection in a single enclosure. Class L is the standard fuse class at this rating because of the high interrupting capacity and the physical fuse dimensions required to handle 800 amp continuous duty. Time-delay Class L fuses are the typical pick for motor and transformer feeders; fast-acting Class L is used where downstream equipment short-circuit current ratings need tight let-through limits.

Non-fusible 800 amp disconnects provide isolation only and sit downstream of an existing overcurrent device — typically a feeder breaker in a panelboard, switchboard, or motor control center main. Non-fusible units are the correct call when the upstream protection device already handles short-circuit and overload duty and the local switch only needs to satisfy the NEC 110.26 working space and means-of-disconnect requirements. They also reduce inventory burden because no fuses are required to keep the switch in service.

Related Amp Ratings In Stock

If your load calculations land between standard frame sizes, we also stock 400 amp, 600 amp, 1000 amp, and 1200 amp disconnects in matching brands and enclosures. Mixed-rating orders ship together to consolidate your install schedule on one delivery and one freight bill.

Why Contractors Source 800 Amp Disconnects From Verified Breakers

• 24 to 48 hour turnaround on in-stock 800 amp safety switches when factory lead times run 20-plus weeks
• Nationwide shipping from Colorado, Texas, and California distribution points to any commercial job site
• Direct quotes from a procurement specialist, not a chatbot — you talk to someone who can confirm voltage, pole count, fuse class, and enclosure rating on the first call
• Emergency build service for non-standard configurations when no stock unit matches the submittal
• Submittal documentation on request, including cut sheets, short-circuit ratings, and NEMA enclosure certifications for engineer-of-record approval

If an 800 amp disconnect is on your panel schedule and the manufacturer just quoted you a Q4 delivery, request a quote below. We will price the in-stock units that match your specification, confirm shipping window, and have the switch on a truck the same business day in most cases.

Request a quote on an 800 amp disconnect →