The Square D Magnetic Motor Starter has long been recognized as a dependable solution for industrial and commercial motor control. Designed to provide safe, consistent, and efficient starting and stopping of AC motors, this NEMA-rated starter reflects the engineering standards and durability that Square D products are known for. With a 208VAC coil, NEMA Size 00, and nonreversing action, this starter is ideal for applications requiring compact size, accurate overload protection, and long service life.
This comprehensive article provides a detailed overview of the Square D NEMA Size 00 magnetic motor starter, including its construction, performance characteristics, overload protection system, electrical ratings, applications, and long-term value. All technical specifications are accurately presented, making this guide useful for electricians, engineers, maintenance technicians, and facility managers.
Overview of the Square D Magnetic Motor Starter
The Square D NEMA magnetic motor starter is a full-voltage starter designed to control both single-phase and three-phase AC motors. Built to NEMA standards, it offers predictable performance, robust construction, and compatibility with a wide range of industrial motor applications.
This particular model features a 208VAC control coil, supports 3-pole configurations, and accommodates motors up to 2 horsepower, depending on voltage. It does not include an enclosure, allowing it to be installed within custom panels or control cabinets where environmental protection is already provided.
By combining a compact footprint with advanced overload protection, this starter meets the needs of modern electrical systems without sacrificing reliability.
Key Product Specifications
The following table outlines the core technical specifications of the Square D Magnetic Motor Starter NEMA Size 00, based on verified product data.
Product Specifications Table
| Specification | Details |
|---|---|
| Item Type | Magnetic Motor Starter |
| Brand | Square D |
| Starter Type | NEMA |
| NEMA Size | 00 |
| Action | Nonreversing |
| Number of Poles | 3 |
| Coil Voltage | 208 VAC |
| Frequency | 60 Hz |
| Maximum Voltage | 600 VAC |
| AC Current Rating | 9 Amps |
| HP @ 3 Phase 208V | 1-1/2 HP |
| HP @ 3 Phase 240V | 1-1/2 HP |
| HP @ 3 Phase 480V | 2 HP |
| HP @ 3 Phase 575V | 2 HP |
| Enclosure Rating | No Enclosure |
| Height | 6.77 inches |
| Width | 3.5 inches |
| Depth | 4.22 inches |
| Standards | UL Listed, CSA Certified |
NEMA Design and Industrial Reliability
One of the defining characteristics of the Square D NEMA Size 00 motor starter is its adherence to NEMA standards. Unlike IEC-rated starters, NEMA starters are designed with higher safety margins, allowing them to handle a broader range of electrical and mechanical stresses.
Advantages of NEMA Motor Starters
- Greater tolerance for voltage fluctuations
- Robust contact construction
- Longer electrical and mechanical life
- Simplified motor matching by horsepower rating
The NEMA Size 00 classification indicates suitability for smaller motors while maintaining industrial-grade durability. This makes the starter ideal for control panels, machinery, and equipment where reliability is critical.
Full-Voltage Motor Starting Capability
The Square D magnetic motor starter 208VAC is a full-voltage starter, meaning it applies full line voltage to the motor during startup. Full-voltage starting is commonly used in applications where motors are designed to handle inrush current and where rapid acceleration is desirable.
Benefits of Full-Voltage Starting
- Quick motor acceleration
- Simple control circuitry
- Reduced system complexity
- Consistent torque during startup
This starter supports both 1-phase and 3-phase AC motors, providing flexibility across a wide range of installations.
Thermal Overload Protection with Class 20 Performance
A critical feature of the Square D NEMA magnetic motor starter is its use of melting alloy thermal overload relays. These overload relays provide Class 20 thermal protection, meaning they are designed to trip within 20 seconds under overload conditions.
Overload Protection Features
- Accurate response to sustained overcurrent
- Protection against motor overheating
- Manual push-to-test functionality
- Visible trip indicator for quick diagnostics
Thermal units are sold separately, allowing installers to select the appropriate overload heaters based on motor full-load current. This customization ensures precise protection for each motor application.
Trip-Free Construction for Enhanced Safety
The overload relay in this Square D magnetic motor starter features trip-free construction, a vital safety characteristic. Trip-free design ensures that the overload relay will trip even if the reset lever is held in the reset position or mechanically blocked.
Safety Benefits of Trip-Free Design
- Prevents forced operation under overload
- Protects motors from sustained damage
- Enhances operator safety
- Complies with industrial safety standards
This design reinforces the starter’s role as a protective device, not just a control component.
Contact Design and Arc Suppression
The internal contact system of the Square D NEMA Size 00 starter is engineered for durability and performance. Angled contacts provide high contact pressure and positive seating, ensuring reliable electrical connections during operation.
Contact System Highlights
- Angled contacts for secure engagement
- High contact pressure reduces resistance
- Spring-assisted gravity dropout mechanism
- Rapid arc extinction upon de-energizing
The gravity-assisted dropout helps extinguish arcing quickly when contacts open, minimizing wear and extending contact life. This is especially important in applications with frequent start-stop cycles.
Holding Circuit and Control Compatibility
The Square D magnetic motor starter includes a normally open holding circuit contact designed for 3-wire control circuits. This configuration is commonly used in industrial motor control systems, allowing remote start and stop functionality through control stations or automation systems.
Control Circuit Advantages
- Compatible with standard push-button stations
- Supports remote control operation
- Enhances system flexibility
- Simplifies integration into existing panels
This makes the starter suitable for both standalone equipment and integrated control systems.
Compact Size for Panel Integration
Despite its industrial capabilities, the Square D NEMA 00 motor starter features a compact form factor. With a height of 6.77 inches, width of 3.5 inches, and depth of 4.22 inches, it fits easily into control panels and enclosures where space is limited.
Dimensional Overview Table
| Dimension | Measurement |
|---|---|
| Height | 6.77 inches |
| Width | 3.5 inches |
| Depth | 4.22 inches |
The absence of an enclosure allows for flexible installation within custom panels, making it ideal for OEM applications and retrofit projects.
Electrical Ratings and Horsepower Compatibility
The Square D magnetic motor starter NEMA Size 00 is rated for a maximum of 9 amps AC and supports motors across multiple voltage levels.
Horsepower Ratings by Voltage
| Voltage | Horsepower Rating |
|---|---|
| 208V 3 Phase | 1-1/2 HP |
| 240V 3 Phase | 1-1/2 HP |
| 480V 3 Phase | 2 HP |
| 575V 3 Phase | 2 HP |
These ratings make the starter suitable for small motors used in pumps, fans, conveyors, and auxiliary equipment.
Typical Applications
The Square D NEMA magnetic motor starter is widely used across various industries due to its reliability and standardized design.
Common Applications
- Industrial pumps
- HVAC fans and blowers
- Conveyors and material handling equipment
- Machine tools
- Packaging machinery
- Commercial ventilation systems
Its ability to operate in 50/60 Hz systems and up to 600VAC maximum voltage adds to its versatility.
Compliance and Certification
This Square D magnetic motor starter is UL Listed and CSA Certified, confirming compliance with North American safety and performance standards.
Importance of Certification
- Ensures electrical safety
- Meets regulatory requirements
- Facilitates inspection approval
- Provides confidence in long-term reliability
Certified components are essential in commercial and industrial installations where safety and compliance are non-negotiable.
Installation Considerations
Because this starter is supplied without an enclosure, it is typically installed within a properly rated control cabinet or panel. This approach allows the installer to select an enclosure suitable for the specific environment, whether it requires dust protection, moisture resistance, or washdown capability.
Key installation considerations include:
- Proper selection of thermal overload units
- Adequate panel ventilation
- Secure mounting to prevent vibration
- Correct wiring according to local electrical codes
Durability and Long-Term Performance
Square D starters are known for long service life, and the NEMA Size 00 magnetic motor starter is no exception. Its robust construction, high-quality contacts, and reliable overload system reduce the likelihood of premature failure.
Over time, these characteristics translate into:
- Reduced maintenance requirements
- Lower total cost of ownership
- Minimal downtime
- Consistent motor protection
Comparison with Generic Motor Starters
When compared to generic or non-NEMA starters, the Square D magnetic motor starter 208VAC offers several advantages.
Comparison Table
| Feature | Square D NEMA 00 Starter | Generic Starter |
|---|---|---|
| Standard | NEMA | Varies |
| Overload Protection | Class 20 Thermal | Often Lower Accuracy |
| Contact Design | Angled, High Pressure | Flat, Standard |
| Certifications | UL, CSA | Limited |
| Service Life | Long | Moderate |
| Application Flexibility | High | Limited |
These differences highlight why Square D starters are often preferred in professional installations.
Final Evaluation
The Square D Magnetic Motor Starter NEMA Size 00 is a proven solution for reliable motor control in industrial and commercial environments. Its full-voltage starting capability, Class 20 thermal overload protection, compact size, and robust contact design make it a dependable choice for controlling small AC motors.
With UL and CSA certifications, compatibility across multiple voltage levels, and a reputation for durability, this starter represents a solid investment for professionals seeking consistent performance and long-term reliability. Whether used in new installations or as a replacement component, it delivers dependable motor protection and control aligned with industry standards.