Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
HUBBELL Mechanical Interlock: 480V AC, Three Phase, 20 A, 3 Pole - Watertight Interlocks
HUBBELLWatertight Interlocks

HUBBELL Mechanical Interlock: 480V AC, Three Phase, 20 A, 3 Pole

The HUBBELL Mechanical Interlock (MPN HBL420MI7W) is a watertight interlock rated for 480V AC, three-phase, 20 A, with 3 poles and 4 wires. This unit is configured without reverse service capability.

SKU 3G-OTH-14052

Brand
HUBBELL
Item
Mechanical Interlock: 480V AC, Three Phase, 20 A, 3 Pole
Category
Watertight Interlocks
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

HUBBELL
Manufacturer Part Number
HBL420MI7W
Reverse Service
No
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

HUBBELL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HUBBELL Mechanical Interlock (MPN HBL420MI7W) is a watertight interlock rated for 480V AC, three-phase, 20 A, with 3 poles and 4 wires. This unit is configured without reverse service capability.

Frequently Asked Questions

What is a HUBBELL mechanical interlock used for?

A HUBBELL mechanical interlock is used to safely control power to industrial equipment by preventing plug insertion or removal under load. It is commonly applied in manufacturing, processing, and facility maintenance where 480V AC three-phase power must be reliably disconnected before access.

What are the specifications of the HUBBELL HBL420MI7W?

The HUBBELL HBL420MI7W is a watertight mechanical interlock rated for 480V AC, three-phase, 20 A, with 3 poles and 4 wires. It has no reverse service capability. This unit is designed for demanding industrial environments requiring a durable, sealed enclosure.

Where to buy a HUBBELL mechanical interlock worldwide?

3G Electric supplies the HUBBELL HBL420MI7W mechanical interlock to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this watertight interlock for 480V AC three-phase applications.

How to install a HUBBELL mechanical interlock?

Installation of a HUBBELL mechanical interlock should follow the manufacturer's instructions and local electrical codes. Typically, mount the unit in a dry or wet location as rated, connect line and load conductors to the correct terminals (3 pole, 4 wire), and verify the interlock mechanism disconnects power before plug removal.

Used in

Common applications for HUBBELL
Commercial lighting control — HUBBELL toggle switches (e.g., HBL1203STW) for 3-way switching in office corridors
Industrial maintenance — HUBBELL overhead cables (e.g., OC5MB-03) for tool balancers in assembly lines
Institutional wiring — HUBBELL rocker switches (e.g., DS115ST) for single-pole control in school classrooms
Facility upgrades — HUBBELL decorator wall plates (e.g., P262GY) for standard 2-gang outlet covers in commercial buildings
Electrical repair — HUBBELL panel terminal screws (e.g., HBLTSR) for replacing worn terminals in Series 16 devices
Modern interface — HUBBELL touch switches (e.g., WSS1277SS) for maintained 3-way control in hospitality settings

HUBBELL Products

3G Electric supplies HUBBELL watertight interlocks. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
HUBBELL Mechanical Interlock: 240V AC, Three Phase, 20 A, 3 Pole, 4 Wire (MPN HBL420MI9W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 240V AC, Three Phase, 20 A, 3 Pole, 4 Wire (MPN HBL420MI9W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 20 A, 3 Pole, 4 Wire (MPN HBL420MI5W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 20 A, 3 Pole, 4 Wire (MPN HBL420MI5W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 250V DC/600V AC, Single/Three Phase, 30 A, 3 Pole, 4 Wire (MPN HBL430MIS2W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 250V DC/600V AC, Single/Three Phase, 30 A, 3 Pole, 4 Wire (MPN HBL430MIS2W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 120/240V AC, Single Phase, 20 A, 3 Pole, 4 Wire (MPN HBL420MI12W). Key specifications — Brand: HUBBELL; Reverse Service: No; Voltage Rating: 120/240V AC.
HUBBELL
HUBBELL Mechanical Interlock: 120/240V AC, Single Phase, 20 A, 3 Pole, 4 Wire (MPN HBL420MI12W). Key specifications — Brand: HUBBELL; Reverse Service: No; Voltage Rating: 120/240V AC.
HUBBELL Mechanical Interlock: 480V AC, Three Phase, 30 A, 3 Pole, 4 Wire (MPN HBL430MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 480V AC, Three Phase, 30 A, 3 Pole, 4 Wire (MPN HBL430MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 480V AC, Three Phase, 100 A, 3 Pole, 4 Wire (MPN HBL4100MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 480V AC, Three Phase, 100 A, 3 Pole, 4 Wire (MPN HBL4100MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.

More from HUBBELL

View all HUBBELL parts →
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 30 A, 3 Pole, 4 Wire (MPN VWSQ3034). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 30 A, 3 Pole, 4 Wire (MPN VWSQ3034). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 60 A, 3 Pole, 4 Wire (MPN VWSQ6034). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 60 A, 3 Pole, 4 Wire (MPN VWSQ6034). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 600V AC, Single Phase, 60 A, 2 Pole, 3 Wire (MPN VWSQ6023). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 600V AC, Single Phase, 60 A, 2 Pole, 3 Wire (MPN VWSQ6023). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 240V AC, Three Phase, 60 A, 3 Pole, 4 Wire (MPN HBL460MI9W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 240V AC, Three Phase, 60 A, 3 Pole, 4 Wire (MPN HBL460MI9W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 277/480V AC, Three Phase, 30 A, 4 Pole, 5 Wire (MPN HBL530MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 277/480V AC, Three Phase, 30 A, 4 Pole, 5 Wire (MPN HBL530MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 480V AC, Single Phase, 60 A, 2 Pole, 3 Wire (MPN HBL360MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 480V AC, Single Phase, 60 A, 2 Pole, 3 Wire (MPN HBL360MI7W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 100 A, 3 Pole, 4 Wire (MPN HBL4100MI5W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 600V AC, Three Phase, 100 A, 3 Pole, 4 Wire (MPN HBL4100MI5W). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL Mechanical Interlock: 600V AC, Single Phase, 30 A, 2 Pole, 3 Wire (MPN VWSQ3023). Key specifications — Brand: HUBBELL; Reverse Service: No.
HUBBELL
HUBBELL Mechanical Interlock: 600V AC, Single Phase, 30 A, 2 Pole, 3 Wire (MPN VWSQ3023). Key specifications — Brand: HUBBELL; Reverse Service: No.