Fusible Disconnect Switch · 3-Pole 600A 240V SE Rated · NEMA 1 Heavy Duty 3 Phase · ABB THF4326A1CN
Heavy-duty fusible safety disconnect switch for 240V three-phase systems, rated 600A with a NEMA 1 indoor enclosure and 3-pole, 4-wire configuration. Commonly used for feeder isolation, service entrance applications in Canada, and equipment shutdown where visible blade isolation and fuse protection are required.
What this product is for
The ABB THF4326A1CN is a heavy-duty fusible safety disconnect switch used to isolate 240V AC three-phase power for maintenance, lockout, and emergency shutdown. It is built for indoor installation in commercial and industrial electrical distribution systems where a 600A fused disconnect is required.
Use for
- 600A three-phase feeder isolation
- Service entrance applications in Canada where the specified certified version is required
- Mechanical equipment, process loads, large distribution sections, and industrial power circuits
- Installations requiring visible blade disconnecting means and field-selected fuse protection
Avoid for
- Outdoor locations unless a weather-rated enclosure such as NEMA 3R or better is specified
- Applications requiring a non-fusible disconnect
- Systems above 240V AC
- Tight spaces where enclosure depth, width, and working clearance are limited
Best for
Best for electricians, panel shops, OEMs, and maintenance teams specifying a heavy-duty indoor fusible disconnect for high-amperage 240V three-phase distribution. This model suits jobs where fuse coordination, visible isolation, and a neutral factory-installed 4-wire configuration matter.
Installed in
Typically installed in electrical rooms, service areas, manufacturing facilities, commercial buildings, and indoor utility spaces. The enclosure is approximately 22.9 in W x 8.3 in D x 50.9 in H (about 582 x 211 x 1293 mm), so confirm wall space and code-required working clearance before ordering.
Why this product exists
This switch provides a code-oriented means to disconnect and protect large loads using replaceable fuses. Compared with breaker-only isolation, a fusible disconnect can help with selective protection strategy depending on the fuse class and system design.
Compared with similar products
Choose this heavy-duty fusible model when you need a 600A, 240V, 3-pole indoor disconnect with fuse capability and service entrance suitability for Canada. Compared with general-duty switches, heavy-duty models are commonly selected for commercial and industrial distribution work. As typical guidance, disconnect selection should also consider available fault current, fuse class, conductor terminations, and enclosure location. Actual suitability depends on installation conditions, equipment ratings, and local electrical code.
Specifications
- Manufacturer part number: THF4326A1CN
- Brand: ABB
- Product type: Fusible safety disconnect switch
- Duty type: Heavy duty
- Voltage rating: 240V AC
- Amperage rating: 600A
- Poles: 3
- Wires: 4
- Phase: 3-phase
- Frequency: 50/60 Hz
- Enclosure: NEMA 1 indoor
- Certification note: CSA version / service entrance suffix for Canada
- Short-circuit current rating: up to 200 kA when properly fused as specified
- Fuse compatibility: Class J/R insulation listing noted on distributor source; verify exact fuse selection for the application
- Actuator: Donut handle
- Terminals: Line/load lugs
- Mounting: 3/4-point welded bracket
- Approximate dimensions: 22.9 in W x 8.3 in D x 50.9 in H (about 582 x 211 x 1293 mm)
- Wire4 Wire
- Size50.9" High X 23.6" Wide With Handle X 14.4" Deep With Handle
- Service Entrance RatedCSA SE Rated
- PhaseThree Phase
- Poles3 Pole
- Amp600a
- Volt240V
- NemaNema 1
- RatingHeavy Duty
- FusedFusible
- Horse Power RatingStandard Fuse: 75Hp | Time Delay: 200Hp | at 3 Phase 240V
- Fuse Type250V
- Alternate ToSquare D: CH326N | Siemens: HFC326NR | Eaton: CDH326FGK
- BrandABB Electrical Distribution
- Warranty5 year
Minimum Order $20
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Standard Shipping-Free on orders over $500 in Metropolitan Areas / Subject to $750 in Rural Areas.
Minimum Order Is $20
Freight Surcharge Apply To Oversized/Over-Weight Items(Not Limited To):
- PVC and EMT Pipe
- Wire and Cable
- Items over 48 inches in length
Surcharges are applied to items on an individual basis regardless if the rest of the order meets prepaid levels. If a freight line appears at the time of check out it only applies to the Items carrying a surcharge and not the entire basket of goods.
Shipping Options:
- A courier can deliver to your home, office, or your job site
- Pick up at local depot near you (applies to the following locations)
Edmonton Warehouse 8135 Roper Rd Edmonton, T6E 6S4, AB
Orders are typically delivered within two to eleven business days. The transit time begins the first full shipping day after your order leaves our warehouse. Please allow an additional 2-5 days for delivery to remote locations, additional fees may apply.
THE FOLLOWING APPLIES TO STANDARD SHIPPING OPTIONS
- We cannot deliver to P.O. boxes.
- A signature may be required for shipments over $500.
- No weekend delivery.
- Wire & cable, EMT or PVC conduit, tube lamps 4ft or greater, and 10ft ground rods & mast pipes have special conditions.
Standard Shipping cost on orders less than $499
Total shipping cost = "Per Shipment" cost + "Per Item" cost. The "per item" cost is listed in terms of price per pound.
Product Group | Per Shipment* | Per Item |
|---|---|---|
Boxes | $6.99 | $1.49/lb |
Conduit & Raceway | $149.99 | $2.49/lb |
Connectors & Fittings | $5.99 | $1.19/lb |
Data & Structured Home | $5.99 | $1.19/lb |
Distribution Equipment | $5.99 | $1.19/lb |
Emergency Lighting | $6.99 | $1.49/lb |
Heating & Ventilation | $6.99 | $1.49/lb |
Lighting Controls | $5.99 | $1.19/lb |
Lighting Indoor | $6.99 | $1.49/lb |
Lighting Outdoor | $6.99 | $1.49/lb |
Tools | $4.99 | $.99/lb |
Wire & Cable | $49.99 | $2.29/lb |
Wiring Devices | $5.99 | $1.19/lb |
Any combination of the above items | Highest applicable per-shipment charge | As above |
Effective Date: August, 15, 1998(Updated August 2026)
At Evolt Electrical Supply, customer satisfaction is our top priority. Please review our return policy below:
Returns
Defective Items:
- If you receive a defective item, you may return it for a replacement or refund within 30 days of purchase.
- To initiate a return, please contact our customer service team with your order number and a description of the defect.
Non-Defective Items:
- We do not accept returns for non-defective items. All sales are final once the product is shipped or ordered from the manufacturer. In certain circumstances we may amend this so feel free to contact our customer service team.
Return Process
Authorization:
- Before returning any items, you must obtain a Return Merchandise Authorization (RMA) number from our customer service team. Returns without an RMA number will not be accepted.
- Backordered items can not be cancelled if the item is in transit from the manufacturer, contact us to review.
Shipping:
- Customers are responsible for the return shipping costs. We recommend using a trackable shipping service or purchasing shipping insurance.
Condition:
- Returned items must be in their original packaging and condition. Any items returned damaged due to improper packaging or misuse will not be eligible for a refund or replacement.
Refunds
- Once we receive and inspect your returned item, we will notify you of the approval or rejection of your refund.
- Approved refunds will be processed within [7] business days and a credit will automatically be applied to your original method of payment.