Disconnects — Emergency Build & Same-Day Stock

When a service disconnect fails on a live commercial feeder, the building goes dark and the clock starts. Verified Breakers stocks heavy-duty safety switches and service disconnects from 200 amp through 1200 amp and beyond across every major brand — Square D, Siemens, Eaton, Cutler Hammer, ABB, and GE — ready to ship inside 24 to 48 hours when manufacturer lead times stretch past 20 weeks.

What a Disconnect Switch Does

A disconnect (also called a safety switch, service disconnect, or main disconnect) gives electrical contractors and facility teams a single-throw means of isolating an electrical circuit for maintenance, fault clearing, or lockout/tagout. Every commercial and industrial service requires a means of disconnect at the service entrance, at motor loads above defined horsepower thresholds, and at any equipment that needs to be serviced without de-energizing the entire panel.

Our inventory covers the full commercial and industrial range. We do not stock the 30, 60, or 100 amp homeowner-grade switches you find at a hardware store — every disconnect in our catalog is sized for B2B procurement: data center service entrances, manufacturing line feeders, HVAC plant, motor control centers, generator transfer points, and switchboard tie-ins.

Fusible vs Non-Fusible Disconnects

The first procurement decision on any disconnect is whether you need overcurrent protection built into the switch or only isolation.

Fusible disconnects accept Class J, Class R, or Class L time-delay fuses depending on amp rating, providing both isolation and overcurrent protection in a single enclosure. Class J is the standard pick for new commercial work because of the smaller footprint and current-limiting performance. Class R is common on retrofit jobs where the existing fuse clips dictate the type. Class L is the choice on larger frame sizes from 601 amp upward.

Non-fusible disconnects provide isolation only and are used downstream of an existing overcurrent device — typically a feeder breaker in a panelboard or switchboard. Non-fusible units are the right call when the upstream breaker already handles short-circuit and overload protection and the local switch only needs to satisfy the NEC working-space and means-of-disconnect requirements.

Heavy Duty vs General Duty

Heavy-duty (HD) safety switches are the standard on commercial and industrial installations. They are rated for 200,000 AIC with the correct fuse, carry voltage ratings to 600V AC, and use a quick-make / quick-break mechanism that handles the higher fault currents found on three-phase systems. Every disconnect we stock is heavy-duty unless explicitly noted.

General-duty (GD) switches are 240V single-phase only and are not appropriate for the commercial three-phase loads our customers source. If a spec calls for general-duty equipment, the install is almost certainly outside our wheelhouse.

Service Entrance Rated Disconnects

When a disconnect is the first means of disconnect after the utility service drop, it must be service entrance rated. Service entrance rated disconnects ship with a factory-installed neutral assembly bonded to the enclosure and meet UL 869A. Eaton's DH-EM series, Square D's H-frame service entrance models, and Siemens HF service rated variants are stocked across the common amp ratings. If the panel schedule calls for SE-rated, specify it on the quote request — the wrong neutral bond on a service entrance disconnect will fail inspection.

NEMA Enclosure Options

Safety switches ship in the full NEMA enclosure range so the switch matches the install environment without field modification:

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

Voltage classes span 240V, 480V, and 600V AC three-phase. Pole configurations include two-pole, three-pole, and four-pole — the four-pole option is typical when a switched neutral is required for a separately derived system or a transfer switch application.

Amp Ratings In Stock

Our disconnect inventory runs from 200 amp commercial service work up through 1200 amp main switchboard feeders, with larger frame sizes available on emergency build. Each amp rating has its own collection page with brand-specific availability and lead times:

• 600 Amp Disconnects — the workhorse size for mid-range commercial services, MCC feeders, and large rooftop HVAC plant. Square D H366, Siemens HF, Eaton DH series in stock.
• 800 Amp Disconnects — sized for larger commercial buildings, data center sub-feeds, and industrial process loads. Heavy-duty fusible and non-fusible across all major brands.
• 1000 Amp Disconnects — main service disconnects for large commercial campuses and the upstream side of paralleled generator gear.
• 1200 Amp Disconnects — main switchboard feeders, large industrial services, and high-capacity motor control center incomers.

Between standard frame sizes, 200 amp, 400 amp, and 800 amp variants are also stocked in matching brands and enclosures. Mixed-rating orders ship together to keep the install schedule on one delivery.

Brand Coverage

Every manufacturer specified on modern commercial drawings is represented in our inventory:

• Square D — H-series and D-series heavy duty safety switches, plus Heavy Duty I-Line and H-frame variants for switchboard tie-ins
• Siemens — HF and HNF series fusible and non-fusible disconnects
• Eaton / Cutler Hammer — DH series heavy duty, DH-EM service entrance rated, DG series
• ABB — THN3-series non-fusible and TLN3-series fusible three-pole disconnects
• GE — TH and TC series industrial disconnects

If your spec calls for a discontinued or hard-to-source catalog number, our procurement desk will locate, refurbish, or build a code-compliant equivalent. Brand cross-references are part of every quote.

Commercial and Industrial Applications

Most quote requests we see fall into one of five buckets: data center service entrance and MCC feeders, manufacturing line and process loads, large commercial HVAC and rooftop equipment, generator transfer and paralleling gear, and emergency replacement work on existing switchboard lineups. Each application drives a different combination of amp rating, fuse class, enclosure type, and service entrance status — specify the application on the quote request and our team will confirm the correct configuration before shipping.

Why Contractors Source Disconnects From Verified Breakers

• 24 to 48 hour turnaround on in-stock safety switches when manufacturer lead times are 20+ weeks
• Nationwide shipping from Colorado, Texas, and California distribution points
• Direct quotes from a procurement specialist, not a chatbot — you talk to someone who can confirm fit, voltage, pole count, and SE-rating on the first call
• Emergency build service for non-standard configurations when no stock unit matches the spec
• Commercial and industrial only — we do not stock residential equipment, so the catalog is focused on the gear your projects actually use

If a disconnect is on your panel schedule and the manufacturer just quoted 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 a disconnect →