Skip to main content
Back to Glossary
Electricalaka: MV switchgearaka: medium voltage switchgear

Switchgear

In Plain English

Heavy-duty electrical equipment used in large commercial and industrial buildings to switch and protect high-voltage power systems.

Definition

High-capacity electrical switching and protection equipment used in commercial and industrial applications, typically handling voltages above 600V. Switchgear includes circuit breakers, fuses, and disconnect switches in an integrated assembly that provides overcurrent protection and system isolation. It differs from panelboards in its higher ratings and more robust construction.

Why It Matters in Bidding

Switchgear is typically one of the highest-value electrical line items and carries long lead times, so its pricing and procurement schedule can govern an entire bid's competitiveness and the project's critical path. Estimators must match the gear to the one-line diagram ratings exactly, since under- or over-specifying interrupting capacity or the bus rating creates large cost swings and submittal rejections.

Example

Pricing a hospital electrical room, an estimator gets a quote on the specified 2000A service switchgear, confirms the interrupting rating against the short-circuit study, and notes a 30-week lead time so the GC can sequence the gear release ahead of award.

Related Terms

Circuit BreakerDisconnectFeederTransformer

Frequently Asked Questions

Switchgear is engineered-to-order and frequently has lead times of many months, so it often sits on the critical path. Estimators flag the lead time at bid so the team can plan an early release and avoid schedule liquidated damages, and they confirm whether escalation should be carried on a delayed procurement.
Switchgear handles higher voltages and fault currents with more robust, often drawout, construction and individually mounted breakers, while panelboards serve lower-amperage branch distribution. The distinction drives cost dramatically, so estimators price each to the one-line ratings rather than treating distribution equipment as interchangeable.
They send the one-line diagram, ratings, and specifications to gear vendors for a quote rather than relying on unit costs, because switchgear is custom-configured by voltage, ampacity, interrupting rating, and accessories. The estimator also confirms the short-circuit study assumptions so the interrupting capacity in the bid will survive submittal review.

Need more than definitions?

Get AI-powered bid alerts, automated form filling, and proposal drafting.

Start Free Trial

© 2026 ConstructionBids.ai — A LaderaLabs Product