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Fusible Panelboard Switch

Eaton / Westinghouse FDPS365 - 400A, 600V, 3-Pole Panelboard Switch / Switchboard Unit | AmpState

Part Number QMB221TW
Series FDPS
Amperes 400
Poles 2
Voltage 600
Product Type Fusible Panelboard Switch
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Manufacturer :Eaton / Cutler-Hammer
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Replacement available
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Picture available on request
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CSA / UL Approved
Regular price $1,110.00
Sale price $1,110.00 Regular price
Unit price
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Seamless online shopping experience guaranteed with easy shipping and returns policy.

Shop with Confidence: Our Products come with a Reliable Year-Long Warranty.

Icon
Secure transaction
Icon
FREE & fast shipping on orders over $49
Icon
CSA approved with 1 year warranty
Icon
30 day returns
Square D QMB221TW – 30A/30A, 240V, 2-Pole Fusible Panelboard Switch Split – QMB Series

Eaton / Westinghouse FDPS365 - 400A, 600V, 3-Pole Panelboard Switch / Switchboard Unit | AmpState

Product description
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Meet the Eaton / Westinghouse FDPS365, a purpose-built fusible panelboard switch engineered to take control of feeders in demanding lighting and distribution panel systems. Rated for 400 A at up to 600 V, this rugged 3-pole unit delivers reliable isolation when you need it most—during routine maintenance or fault events. Part of the trusted FDPS family, it combines industrial-grade strength with precise switching in space-constrained panelboards.

What makes the FDPS365 stand out

  • Three-pole simultaneous isolation: Ensures all phases are disconnected at once, simplifying maintenance and enhancing safety in 3‑phase systems.
  • Coordinated fusible protection: Provides feeder overcurrent protection that aligns with upstream fuse class requirements for dependable protection coordination.
  • Rugged, industrial-grade construction: Built to endure the rigors of panelboard environments where reliability matters and space is at a premium.
  • Integrated panelboard fit: Designed to plug cleanly into lighting and distribution panelboard architectures, reducing the need for extra components while preserving clear disconnection capability.

Ideal use scenarios

  • Commercial and industrial lighting panelboards requiring fast, reliable feeder isolation.
  • Distribution panelboards serving subcircuits and feeders that demand dependable 3‑phase switching and overcurrent protection.
  • Maintenance‑friendly environments (electrical rooms, equipment rooms, service areas) where upstream fuse protection is coordinated with a fusible switch.

How it works and installation tips

To achieve proper protection, pair the FDPS365 with a correctly rated upstream protection device and a compatible fuse class. Verify that your panelboard enclosure and bus arrangement align with the unit’s 3-pole footprint and mounting requirements. Keep an on-hand stock of compatible fuses for rapid replacement, helping keep critical feeders online with minimal downtime.

Specifications at a glance

  • Amperage: 400 A
  • Voltage: 600 V
  • Poles: 3
  • Series: FDPS
  • Part Number: FDPS365
  • Manufacturer: Eaton / Cutler-Hammer (Westinghouse branding)
  • Application: Fusible panelboard switch for lighting and distribution panelboards

Available through AmpState, the FDPS365 offers a dependable solution for precise feeder control and protection within lighting and distribution panelboard ecosystems. If you’re optimizing safety, reliability, and space in your electrical infrastructure, this 3‑pole fusible switch is a targeted, practical choice that addresses real-world maintenance and protection needs.

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