In industrial automation, the reliability of your motor protection system determines not just uptime but the overall efficiency of your operation. The Sprecher + Schuh KTA7-45H Motor Starter (23–32A) stands as a powerful example of compact innovation. Designed for seamless motor control and protection, it combines the functionalities of a circuit breaker, overload relay, and disconnect switch—all in a single, space-saving unit.
Whether you’re an engineer designing a control panel, an OEM manufacturer, or a maintenance professional seeking durable motor control, this device offers unmatched performance, compliance, and ease of use.
Understanding the Sprecher + Schuh KTA7-45H Motor Starter
The Sprecher + Schuh KTA7-45H Motor Starter is a manual motor controller that ensures efficient protection for motors in the 23–32A range. It is specifically built to handle demanding industrial environments, offering short-circuit protection, overload protection, and motor isolation within a compact 54mm housing.
This device integrates multiple functions into one, simplifying wiring, installation, and compliance with global standards.
Key Features
● Adjustable Current Range (23–32A): Enables precise motor full-load current setting.
● High Interrupting Capacity (up to 65kA at 480V): Offers robust short-circuit protection.
● Thermal Overload Protection (Class 10): Trips within 10 seconds at 600% rated current.
● Manual Control and Disconnect Function: Operates as an at-motor disconnect per UL standards.
● Auxiliary Contact (KT7-PE1-10) Included: Provides 1 NO contact for control signaling.
● Compact 3-Pole Design: Saves panel space with easy DIN rail or screw mounting.
Technical Breakdown of the Sprecher + Schuh KTA7-45H Motor Starter
Engineered with precision, this motor starter provides high reliability across all motor control applications. Below are its core technical specifications and performance highlights:
|
Specification |
Details |
|
Model/Series |
KTA7-45H-32A (KT7 series manual motor controller) |
|
Adjustable Range |
23–32A |
|
Trip Class |
Class 10 Thermal Overload |
|
Short Circuit Rating (SCCR) |
Up to 65kA @ 480V AC |
|
Voltage Rating |
600V AC (3-phase) |
|
Mounting Options |
DIN rail (35mm) or base-mount |
|
Auxiliary Contact Rating |
1NO (300V AC max) |
|
Certifications |
UL508, CSA, IEC 60947-4-1 / 60947-2, CE |
|
Protection Rating |
IP20 Finger-Safe |
Why the Sprecher + Schuh KTA7-45H Motor Starter is a Game-Changer
1. All-in-One Protection in a Compact Design
Traditional setups often require three separate components—a breaker, an overload relay, and a disconnect switch. The KTA7-45H Motor Starter integrates all three, saving both space and installation time. This compact 3-pole unit is ideal for tight panels and high-density installations.
2. High Short-Circuit and Overload Protection
With a high interrupting capacity of up to 65kA at 480V, the device effectively protects motors from high fault currents. Its Class 10 thermal overload protection ensures fast tripping to prevent motor damage while allowing safe startup current levels.
3. UL Type E Self-Protected Design
The Sprecher + Schuh KTA7-45H Motor Starter is UL Type E certified, which means it can withstand high fault currents without requiring upstream fuses or breakers. This feature simplifies circuit design and reduces component costs.
4. User-Friendly Operation and Reset
The device features a front-mounted rotary knob that allows clear ON/OFF/TRIPPED indication, and it can be padlocked for safety during maintenance. A push-to-trip button enables functional testing of the trip mechanism and auxiliary circuit.
5. Reliable Auxiliary Contact for Control Signaling
The included KT7-PE1-10 auxiliary contact (1 Normally Open contact) allows signaling for remote monitoring or interlocking. It can be used to indicate the motor’s operational state or disconnect control power in case of a fault.
Certifications and Global Compliance
The Sprecher + Schuh KTA7-45H-32A is globally recognized for its compliance with international safety and quality standards. It is UL Listed and CSA Certified for use as a manual motor controller and disconnecting means, meeting NEC and NFPA codes.
Additionally, it adheres to IEC 60947-4-1 and IEC 60947-2, carrying CE and RoHS compliance. The motor starter is suitable for industrial, HVAC, marine, and OEM environments, providing engineers with a universally accepted solution.
Advanced Design Insights
Sprecher + Schuh designed the KT7 family, including the KTA7-45H Motor Starter, to deliver top-tier protection and ease of integration:
● Current Limiting Design: Reduces let-through current during faults, preventing damage to downstream equipment.
● Temperature Compensation: Maintains accurate tripping performance across various ambient temperatures.
● High-Endurance Construction: Durable housing materials meet UL94 flammability ratings and IEC shock standards.
● Flexible Mounting: DIN rail and base mounting options provide installation flexibility for any panel layout.
Applications of Sprecher + Schuh KTA7-45H Motor Starter
The versatility of the KTA7-45H-32A makes it applicable in a wide range of industries and systems:
1. Direct Manual Motor Control
Ideal for local ON/OFF operation of pumps, fans, and compressors. Operators can manually reset and monitor motor protection status with ease.
2. Motor Control Centers (MCCs)
Multiple KTA7 Motor Starters can be installed in panels for group motor installations, reducing wiring complexity and improving fault coordination.
3. Self-Protected Combination Starters (Type E/F)
When paired with Sprecher + Schuh CA7 contactors, the KTA7 becomes a Type F combination starter—offering both local and remote motor control with superior protection.
4. OEM Machinery and Equipment
Machine builders use the KTA7-45H Motor Starter to simplify wiring, minimize footprint, and ensure compliance with UL and CE standards across export markets.
5. Pump Panels and HVAC Systems
Commonly used in pump panels, water treatment facilities, and HVAC fan motors due to its current-limiting protection and compact form.
6. Mining and Heavy Industries
Its rugged construction and high fault capacity make it suitable for conveyor, crusher, and industrial machinery applications in harsh environments.
Alternative Models and Compatible Accessories
Sprecher + Schuh’s KT7 family offers flexibility for different needs:
|
Variant |
Description |
|
KTB7 |
Magnetic-only breaker; pair with an overload relay for custom protection curves. |
|
KTC7 |
Designed for high-efficiency motors with higher inrush currents. |
|
KTV7 |
Tailored for multi-motor systems on VFDs. |
|
KT9 Series |
Successor to KT7 with improved SCCR, unified frame, and enhanced features. |
Compatible accessories include undervoltage trips, shunt trips, enclosure kits, and auxiliary contact blocks (KT7-PA1 series) for expanded control capabilities.
Advantages of Using the Sprecher + Schuh KTA7-45H Motor Starter
● Simplifies wiring and installation
● Eliminates need for external fuses (Type E)
● Reduces panel space by integrating three functions
● Provides reliable trip signaling through auxiliary contacts
● Certified for both North American and international markets
● Compatible with multiple Sprecher + Schuh accessories
Sprecher + Schuh KTA7-45H vs. KT9: Evolution of Motor Protection
Sprecher + Schuh has transitioned much of its KT7 series to the KT9 generation, offering advanced features such as lower heat dissipation, improved coordination, and simplified selection. However, the KTA7-45H-32A remains widely available and fully supported for existing installations, proving its lasting reliability.
Conclusion: Reliable Motor Protection, Simplified
The Sprecher + Schuh KTA7-45H Motor Starter (23–32A) is a trusted solution for engineers, panel builders, and OEMs seeking compact, efficient, and compliant motor protection. With its all-in-one design, high short-circuit capacity, and auxiliary control features, it ensures both safety and simplicity in industrial motor control.
If you’re looking for a dependable motor starter that meets UL, CSA, and IEC standards—without the bulk or complexity—explore the Sprecher + Schuh KTA7-45H-32A Motor Starter with KT7-PE1-10 Auxiliary Contact today.
Visit Industrial Electrical Warehouse to learn more and integrate Sprecher + Schuh reliability into your next project.
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