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Quad Circuit Breaker · 2 x 1-Pole 15A + 1 x 2-Pole 40A · Type QT Non-CTL Plug-In · Siemens Q21540CTNC
SKU: Q21540CTNC
Siemens Q21540CTNC is a Type QT non-CTL plug-in quad breaker with two 15A single-pole circuits and one common-trip 40A double-pole circuit for 120/240V loadcentres. It is commonly used where panel space is limited and a listed quad configuration is required; always confirm panel compatibility and local code before ordering.
Delivered to you by Sep 20 (Within Western Canada)
If shipping issues arise, contact us and we’ll work with the courier to keep your job on track.
What this product is for
This Siemens Type QT non-CTL quad circuit breaker provides two 15A 1-pole circuits and one 40A 2-pole common-trip circuit in a compact plug-in format for compatible 120/240V loadcentres. It is used for branch-circuit overcurrent protection where a quad arrangement is specifically permitted by the panel and breaker schedule.
Use for
Use for Siemens-compatible loadcentres that accept Type QT quad breakers and require a combination of two 15A 120V circuits plus one 40A 240V common-trip circuit. This layout is commonly selected for renovation work, panel reconfiguration, or space-constrained residential and light commercial distribution equipment.
Avoid for
Avoid using this breaker in panels not listed for Siemens Type QT quad breakers, or where CTL versus non-CTL requirements are not confirmed. Do not substitute based on physical fit alone; breaker acceptance depends on the loadcentre label, bus design, and code-compliant application.
Best for
Best for electricians replacing an existing Siemens quad breaker or adding circuits in older or space-limited panels where a non-CTL configuration is required. It is also a practical choice when one 240V load and two 120V branch circuits need protection from a single breaker position arrangement.
Installed in
Typically installed in Siemens residential or light commercial loadcentres rated for 120/240V AC systems. Product references indicate this model is a plug-in Type QT design; practical fit and approval must be verified against the panel directory and manufacturer documentation before installation.
Why this product exists
This breaker exists to help contractors add or replace specific branch-circuit combinations without using as much panel space as separate full-size breakers. In typical field use, quad breakers help maintain circuit separation where a 2-pole load and two 1-pole loads must be accommodated in a compact footprint.
Compared with similar products
Compared with standard full-size breakers, this quad breaker saves panel space by combining multiple protected circuits into one assembly. Compared with CTL versions, this non-CTL model is intended for applications where the panel listing permits a non-CTL breaker. As a rule of thumb, always match breaker type, pole arrangement, and panel approval exactly rather than choosing by amperage alone.
Actual suitability depends on panel model, bus configuration, installation conditions, and local electrical code.
Specifications
- Manufacturer: Siemens
- Manufacturer part number: Q21540CTNC
- Product type: Quad / triplex plug-in circuit breaker
- Breaker type: Type QT
- Configuration: 2 x 1-pole 15A + 1 x 2-pole 40A common trip
- Voltage rating: 120/240V AC
- Interrupt rating: 10 kAIC
- Trip type: Thermal-magnetic
- Application: Branch-circuit overcurrent and short-circuit protection
- Connection: Plug-in
- Wire range: approximately #8 to #6 AWG and #8 to #4 AWG depending on pole position; confirm manufacturer documentation before installation
- Dimensions: approximately 2.4 in L x 2 in W x 3.12 in H (61 mm x 51 mm x 79 mm)
- Compliance note: Non-CTL version; verify loadcentre acceptance before use
- BrandSiemens Breakers
- Warranty5 year
- Electrical
- PolesQuad
- Amps2P15A-1P40A
- Physical
- MountingPush on
- Breaker TypeStandard
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.
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