BRAH Electric
 
Square D, Schneider Electric PQ4603J replacement Fusible Bus Plug – BRAH BPQ3603N
BPQ3603N Fusible Bus Plug – view 1 of 3BPQ3603N Fusible Bus Plug – view 2 of 3BPQ3603N Fusible Bus Plug – view 3 of 3

Square D PQ4603J Replacement Fusible Bus Plug

BRAH BPQ3603N replaces the PQ4603J fusible bus plug: 30A, 600V, 3-phase, 4-wire. Part of the I-Line I & II family. Covered by a BRAH Electric 2-year warranty; in-stock orders placed before 3:00 PM Pacific ship the same business day.

Factory New
Drop-in fit
Matches OEM Specs
In Stock
$1,417.00USD
1
2-Year Warranty included
(855) 355-2724Average waiting time: 1 min

Product Specifications

Datasheet

PQ4603, 30 amp, 600 volt, 3 phase, 4 wire, fusible style bus plug, type BPQ / PQ, suitable for use with OEM Square D / Schneider Electric I-Line I and I-Line II industrial busway systems, accepts Class H, R and J fuse types, direct substitute, fit and function for Square D OEM PQ4603, PQ4603R, PQ4603J.

BRAH part: BPQ3603N. Also replaces: PQ4603, PQ4603R

BPQ3603N specifications
BRAH Part NumberBPQ3603N
Replacement for OEM Part #PQ4603, PQ4603R, PQ4603J
Replacement for OEM MfrSquare D, Schneider Electric
FamilyI-Line I & II
TypePQ, BPQ
Amperage30A
Voltage600V
Phase3PH
Wire4W
GroundFALSE
Weather StrippingFALSE
Fuse ClassH, R, J
AIC Rating200kA@480VAC
StyleFusible

Frequently Asked Questions

Is this a direct drop-in replacement?
Yes. All BRAH Electric products are engineered as 1:1 direct replacements for the corresponding OEM part. No modifications, adapters, or special wiring are required for installation.*
*Exceptions may apply.
What warranty is included?
Every BRAH product ships with a 2-year warranty from the date of invoice. We guarantee proper function without defects according to provided specifications. Contact Kits carry a 6-month warranty.
Do you offer volume or bulk pricing?
Yes. If you are purchasing 10 or more units, or plan to buy regularly, you may qualify for our volume or reseller pricing program. Click on the product page or call us at (855) 355-2724.
What is your return policy?
Returns must be approved by a BRAH Electric representative with an RMA number. Returns within 30 days of shipment are subject to a restocking charge of 25–50%. Items are non-refundable after 30 days. Contact our support team to request an RMA. If you are unsure about product fit, call us at (855) 355-2724. See our Policies page for full details.
How fast will my order ship?
In-stock items ordered before 3:00 PM (Pacific) ship the same business day. You can see the live shipping countdown timer on the product page. Most domestic orders arrive within 2–5 business days.
Is this compatible with my Square D, Schneider Electric busway?
Yes. This BRAH replacement is engineered for direct compatibility with Square D, Schneider Electric busway systems and follows the same mounting and electrical specifications as the original part.
What OEM part numbers does BPQ3603N replace?
BPQ3603N is a direct replacement for PQ4603, PQ4603R, PQ4603J. No modifications or adapters are required—it installs like the original.
Is BPQ3603N a drop-in replacement for PQ4603, PQ4603R, PQ4603J?
Yes. BPQ3603N is a 1:1 drop-in replacement for PQ4603, PQ4603R, PQ4603J in Square D, Schneider Electric applications. Same mounting and wiring.

Why purchase from BRAH Electric?

The new leader in aftermarket electrical parts. Trusted by more than 10k customers. Parts are tested at BRAH Electric's Carlsbad, California facility.

Rated 5.0 from 33 Google reviews (as of October 2026). Read our reviews on Google

Factory New
Drop-in fit
Matches OEM Specs
Ships Worldwide
2-Year Warranty included

Related Products

BRAH BPQ3203 Fusible Bus Plug – replaces Square D, Schneider Electric PQ3203
BPQ3203
Substitute for Square D, Schneider Electric PQ3203, PQ3203R, PQ3203J
View Product
Amperage30A
Voltage240V
FamilyI-Line I & II
TypePQ, BPQ
BRAH BPQ3203G Fusible Bus Plug – replaces Square D, Schneider Electric PQ3203G
BPQ3203G
Substitute for Square D, Schneider Electric PQ3203G, PQ3203GR, PQ3203GJ
View Product
Amperage30A
Voltage240V
FamilyI-Line I & II
TypePQ, BPQ
BRAH BPQ3203GN Fusible Bus Plug – replaces Square D, Schneider Electric PQ4203G
BPQ3203GN
Substitute for Square D, Schneider Electric PQ4203G, PQ4203GR, PQ4203GJ
View Product
Amperage30A
Voltage240V
FamilyI-Line I & II
TypePQ, BPQ
BRAH BPQ3203N Fusible Bus Plug – replaces Square D, Schneider Electric PQ4203
BPQ3203N
Substitute for Square D, Schneider Electric PQ4203, PQ4203R, PQ4203J
View Product
Amperage30A
Voltage240V
FamilyI-Line I & II
TypePQ, BPQ

More Square D I-Line I & II replacement parts

View all Square D I-Line I & II replacement parts