Square D NEMA Type S Combinati...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,597.64
Square D NEMA Type S Combination Starter, Size 1, Melting Alloy Overload

Square D NEMA Type S Combination Starter, Size 1, Melting Alloy Overload

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Model: 8538SCASP1

In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,597.64
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Square D NEMA Type S Combination Starter, Size 1, Melting Alloy Overload

The Square D NEMA Type S nonreversing combination starter is engineered for motor control applications, combining motor overload and short circuit protection in a single package. This Size 1 starter is rated up to 5 HP at 208 V AC and 230 V AC, 3 phase, and pairs a fusible disconnect switch (H and K class, 30 A) with a melting alloy overload relay and a 27 A line rated current for dependable, code-compliant motor protection.

Key Features

  • NEMA Size 1 Rating: Delivers up to 5 HP at 208 V AC or 230 V AC, 3 phase, for standard motor control duty.
  • Fusible Disconnect Switch: Integrated H and K class 30 A fusible disconnect switch provides combined disconnect and short circuit protection.
  • Melting Alloy Overload: Melting alloy thermal overload relay protects the motor from sustained overcurrent conditions.
  • Line Rated Current: 27 A rated current supports the Size 1 combination starter configuration.
  • 3-Pole (3P) Construction: Nonreversing motor starter type built for single-direction motor control circuits.
  • NEMA 12 Enclosure: Painted sheet steel enclosure with external reset keeps internal components protected in industrial environments.
  • Hand-Off-Auto Control: Selector switch control type simplifies manual and automatic motor operation modes.
  • Rated Voltage: 600 V AC operational voltage rating with a separate control circuit at 120 V AC 60 Hz or 110 V AC 50 Hz.

Certifications & Compliance

  • UL Listed
  • CSA Certified

Technical Specifications

  • Warranty: 18 months
  • Take Back: No
  • Tier: 1
  • Returnability: Yes
  • Warranty Period: 18 months
  • Sustainable Packaging: Yes
  • Packaging Without Single Use Plastic: Yes
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Legacy WEEE Scope: In
  • Poles Description: 3P
  • Nema Size: 1
  • Packaging Made With Recycled Cardboard: Yes
  • With Recycled Cardboard: Yes
  • WEEE Product Category: 5
  • Range Of Product: S
  • Without Single Use Plastic: Yes
  • Compliance: TAA

Typical Applications

  • Commercial and Industrial Motor Control Panels
  • Building Automation Systems
  • Construction Site Electrical Installations
  • Non-Reversing Motor Control Circuits
  • Fused Motor Disconnect and Overload Protection

Why Square D?

Square D combination starters are built with a NEMA 12 painted sheet steel enclosure, melting alloy overload protection, and a fusible disconnect switch to deliver reliable, code-compliant motor control for demanding commercial and industrial environments. Backed by UL Listed and CSA certifications along with an 18-month warranty, this Type S Size 1 starter is engineered for long mechanical life and electrical endurance in professional installations.

Manufacturer Resources

Product Specs

Product Type:
Combination Starter
Series:
Type S
Configuration:
NEMA 12 Enclosure
Voltage Rating:
600V
Amperage Rating:
27A
Product Finish:
Painted Steel
Listing:
UL Listed
Department:
Electrical
Product Group:
Motor Control & Automation
Product Subgroup:
Motor Starters & Contactors

Square D 8538SCASP1 – Frequently Asked Questions

1) What horsepower motor will a Square D Type S Size 1 combination starter run?
NEMA Size 1 covers motors up to 5 HP at 208V AC or 230V AC, three phase. The line rated current is 27A, so size your motor's full load amps under that. If your motor pulls more, you need a Size 2 starter instead.
2) Does the 8538SCASP1 include a disconnect, or do I need a separate fused switch ahead of it?
The disconnect is built in. Model 8538SCASP1 combines a 30A fusible disconnect switch taking H and K class fuses with the starter and overload relay in one enclosure, so it provides both the local disconnect means and short circuit protection. Fuses themselves are a separate purchase sized to your motor.
3) Can I mount a Square D Type S Size 1 combination starter in a washdown or dusty plant area?
The enclosure is NEMA 12, painted sheet steel, which handles dust, falling dirt and dripping non-corrosive liquids in indoor industrial spaces. It is not a NEMA 4X rating, so direct hosedown or outdoor exposure calls for a different enclosure type. The overload reset is external, so you don't open the door to reset.
4) Is this starter reversing? I need forward and reverse on a conveyor.
No. The Type S Size 1 combination starter is a nonreversing, 3-pole unit for single direction motor control only. Forward/reverse duty needs a reversing combination starter with two interlocked contactors.
5) What control voltage does the Square D 8538SCASP1 starter coil use?
The starter uses a separate control circuit at 120V AC 60 Hz, or 110V AC 50 Hz. Operational voltage rating on the power side is 600V AC, so it suits 208V or 230V three phase systems. A Hand-Off-Auto selector switch is fitted, which is what you need if a thermostat, float or building automation contact is doing the automatic starting.
6) What is the closest alternative to the Square D 8538SCASP1 Size 1 combination starter from another manufacturer?
The Eaton Freedom series enclosed combination non-reversing starter, ECN1611EAB, is the nearest cross-brand counterpart: it is also a NEMA Size 1, 3-phase, non-reversing enclosed combination starter. The difference that matters for the install is the enclosure and the disconnect. The Square D Type S 8538SCASP1 comes in a NEMA 12 painted steel enclosure with a fusible H and K class 30 A disconnect switch and a melting alloy overload relay, rated 600 V AC and 27 A line rated current. The Eaton unit is a NEMA 1 enclosure. If the panel location is dusty or subject to dripping liquids, the NEMA 12 rating on the Square D unit is the one to confirm against the spec.
7) Melting alloy versus bimetallic overload, which do I want on a motor starter?
This unit uses a melting alloy thermal overload relay. Melting alloy (eutectic solder pot) units trip on sustained overcurrent and must be reset manually, which suits equipment where you want somebody to look at the machine before it restarts. Bimetallic relays can be set for automatic reset. If you want a relay that resets itself after cooling, this is not the model to specify.
8) Do I still have to order heater elements for this combination starter?
Yes. Melting alloy overload relays take thermal units (heaters) selected from the motor's full load amps, and they are chosen per motor rather than supplied to fit every 5 HP application. Have the motor nameplate FLA and service factor in hand when you order. The disconnect fuses are likewise sized to the motor and bought separately, in H or K class at 30A or less.
9) Is the Square D Type S combination starter UL Listed and CSA certified for an inspected job?
Both. The Type S Size 1 combination starter is UL Listed and CSA Certified, and it carries a TAA compliance statement, which matters on federal and government-funded work.
10) What is the alternative if I don't need a fusible disconnect built into the starter?
Where the branch circuit protection sits upstream in the panel and the enclosure only needs to be indoor general purpose, the Eaton Freedom Size 1 enclosed non-reversing starter (ECN1611EAB) is a NEMA 1 three phase option. The Square D Type S unit is the one to pick when you need the fused disconnect and the heavier NEMA 12 dust-tight enclosure in the same box.
11) Can I use this starter on a 480V three phase motor?
The unit is rated 600V AC operationally, so the power section withstands 480V, but the published horsepower rating is given only at 208V and 230V three phase for Size 1 at 27A. For a 480V motor, order the Type S Size 1 unit built for that voltage rather than assuming this catalog number covers it.
12) If the motor control panel is in a clean indoor electrical room, is there a simpler enclosure option than the Square D Type S Size 1 starter?
Yes. The Square D 8538SCASP1 is built in a NEMA 12 enclosure, which is specified for dust, falling dirt, and dripping noncorrosive liquids. For a clean, dry indoor electrical room where that protection is not required, the Eaton Freedom ECN1611EAB is a NEMA 1 enclosed combination non-reversing starter in the same NEMA Size 1, 3-phase class. Both are enclosed combination starters for single-direction motor control; the choice comes down to the environment the enclosure has to survive.
13) Can the Eaton ECN1611EAB be used in place of the Square D 8538SCASP1 on a reversing motor circuit?
Neither one suits a reversing circuit. The Square D Type S 8538SCASP1 is a nonreversing starter built for single-direction motor control, and the Eaton Freedom ECN1611EAB is likewise a non-reversing combination starter. If the load has to run in both directions, a reversing combination starter is the product to specify instead of either of these.
How fast can I get the Square D 8538SCASP1 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D 8538SCASP1 come with a warranty?
Absolutely. The Square D 8538SCASP1 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D 8538SCASP1?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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