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

SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 1 - Circuit Breaker Starters with Thermal Overloads
SQUARE DCircuit Breaker Starters with Thermal Overloads

SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 1

The SQUARE D NEMA Combination Starter is a circuit breaker starter with thermal overloads, part of the Series 8539. This three-phase, 3-pole unit has a NEMA Size 1 rating, a maximum voltage rating of 600V AC, and a…

SKU 3G-OTH-44341

Brand
SQUARE D
Item
NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 1
Category
Circuit Breaker Starters with Thermal Overloads
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

SQUARE D
Manufacturer Part Number
8539SCG44V02S
Series
8539
Type
NEMA Size 1, NEMA-Rated 1
AC
120V
Phase
Three
Poles
3
Poles/Phase
3 Pole / Three Phase
Coil Voltage
120V AC
Operator Type
No Operator
Control Transformer
No
Includes Pilot Light
No
Maximum Voltage Rating
600V AC
Thermal Units Required
3 Melting Alloy Units (Not Included)
Includes Auxiliary Contacts
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

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

Product Description

The SQUARE D NEMA Combination Starter is a circuit breaker starter with thermal overloads, part of the Series 8539. This three-phase, 3-pole unit has a NEMA Size 1 rating, a maximum voltage rating of 600V AC, and a coil voltage of 120V AC. It requires three melting alloy thermal units (not included) and does not include a control transformer, pilot light, or auxiliary contacts.

Frequently Asked Questions

What is the SQUARE D 8539SCG44V02S combination starter used for?

The SQUARE D NEMA Combination Starter is used to start and protect three-phase motors in industrial applications. It combines a circuit breaker and a NEMA Size 1 starter with thermal overload protection, suitable for systems up to 600V AC. Common uses include conveyors, pumps, and compressors in manufacturing and processing plants.

What are the specifications of the SQUARE D 8539SCG44V02S?

This SQUARE D combination starter is a three-phase, 3-pole unit with NEMA Size 1 and NEMA-Rated 1 enclosure. It has a maximum voltage rating of 600V AC, a coil voltage of 120V AC, and requires three melting alloy thermal units (not included). It does not include a control transformer, pilot light, or auxiliary contacts.

Where to buy the SQUARE D 8539SCG44V02S worldwide?

3G Electric supplies the SQUARE D 8539SCG44V02S combination starter to customers worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact our team to place an order or request a quote for this NEMA Size 1 starter.

How to select thermal units for the SQUARE D 8539SCG44V02S?

Selecting thermal units for this SQUARE D starter requires matching the melting alloy units to the full-load current of your motor. The starter needs three melting alloy thermal units (not included). Refer to the motor nameplate for current rating and consult SQUARE D selection tables to choose the correct heater element for proper overload protection.

Used in

Common applications for SQUARE D
Commercial building electrical panels — Square D QO series plug-in circuit breakers for branch circuit protection
Industrial motor control centers — Square D QOB series bolt-on breakers in NQOD panelboards
Heating equipment installations — Square D QOU series unit-mount breakers for overcurrent protection
Outdoor electrical distribution — Square D L-Frame enclosures housing LAL/LHL breakers for 400 A service
Indoor facility power distribution — Square D Q-Frame enclosures with QBL/QDL breakers for 225 A circuits
Retrofit and replacement in existing Square D load centers — QO series breakers for 120/240V AC systems

SQUARE D Products

3G Electric supplies SQUARE D circuit breaker starters with thermal overloads. 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
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 2, 120V AC, NEMA-Rated 1 (MPN 8538SDG14V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 2, 120V AC, NEMA-Rated 1 (MPN 8538SDG14V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 0, 120V AC, NEMA-Rated 1 (MPN 8538SBG13V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 0, 120V AC, NEMA-Rated 1 (MPN 8538SBG13V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 1, 120V AC, NEMA-Rated 1 (MPN 8538SCG14V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 1, 120V AC, NEMA-Rated 1 (MPN 8538SCG14V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 1, 120V AC, NEMA-Rated 12 (MPN 8538SCA24V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 1, 120V AC, NEMA-Rated 12 (MPN 8538SCA24V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 0, 120V AC, NEMA-Rated 12 (MPN 8538SBA23V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 0, 120V AC, NEMA-Rated 12 (MPN 8538SBA23V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 2, 120V AC, NEMA-Rated 12 (MPN 8538SDA24V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.
SQUARE D
SQUARE D NEMA Combination Starter: Fusible Disconnect, 3 Poles, NEMA Size 2, 120V AC, NEMA-Rated 12 (MPN 8538SDA24V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; For Fuse Class: Class H; Series: 8538.

More from SQUARE D

View all SQUARE D parts
SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 0, 120V AC, NEMA-Rated 12 (MPN 8539SBA53V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; Series: 8539; Includes Auxiliary Contacts: No.
SQUARE D
SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 0, 120V AC, NEMA-Rated 12 (MPN 8539SBA53V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; Series: 8539; Includes Auxiliary Contacts: No.
SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 2, 120V AC, NEMA-Rated 12 (MPN 8539SDA53V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; Series: 8539; Includes Auxiliary Contacts: No.
SQUARE D
SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 2, 120V AC, NEMA-Rated 12 (MPN 8539SDA53V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; Series: 8539; Includes Auxiliary Contacts: No.
SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 1, 120V AC, NEMA-Rated 12 (MPN 8539SCA54V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; Series: 8539; Includes Auxiliary Contacts: No.
SQUARE D
SQUARE D NEMA Combination Starter: Circuit Breaker, 3 Poles, NEMA Size 1, 120V AC, NEMA-Rated 12 (MPN 8539SCA54V02S). Key specifications — Includes Pilot Light: No; Maximum Voltage Rating: 600V AC; Brand: SQUARE D; Phase: Three; Coil Voltage: 120V AC; Control Transformer: No; Series: 8539; Includes Auxiliary Contacts: No.