Sprecher + Schuh KTA9-32S-4.0A Manual Motor Protector
The Sprecher + Schuh KTA9-32S-4.0A is a high-performance, 3-pole manual motor protector and starter designed for precise control and reliable protection of 3-phase electric motors. This “all-in-one” device combines short-circuit protection, thermal overload protection, and manual switching into a single compact 45mm frame.
It is a manufacturer-authorized replacement for the older KTA7-25S series, offering identical electrical performance and the same physical footprint for easy retrofitting.
Key Features & Performance
Adjustable Current Range: Features a wide thermal trip adjustment range of 2.5 to 4.0 Amps, allowing you to fine-tune protection based on your motor’s specific Full Load Amps (FLA).
Class 10 Tripping: Designed to trip in 10 seconds or less during an overcurrent condition, providing standard industrial-grade protection that prevents motor winding damage.
Phase Loss Protection: Includes sensitive mechanisms that accelerate tripping under single-phase conditions, safeguarding your motor against one of the most common causes of failure.
Type E Self-Protected: UL Listed as a Construction Type E self-protected combination motor controller. This often eliminates the need for additional branch circuit protection, saving significant panel space.
Short Circuit Indication: Features a distinct visual indicator that allows operators to differentiate between a thermal overload trip and a magnetic short-circuit trip.
Technical Specifications
| Specification | Details |
| Manufacturer | Sprecher + Schuh |
| Model Number | KTA9-32S-4.0A |
| Adjustment Range | 2.5 – 4.0 Amps |
| Number of Poles | 3-Pole (Supports 1-Phase if wired in series) |
| Frame Size | 45mm (Standard C-Frame) |
| Breaking Capacity | 100 kA @ 400V AC |
| Interrupt Capacity | Standard Interrupting Capacity |
| Trip Type | Thermomagnetic (Class 10) |
| Origin | Switzerland / Italy |
Installation & Application
Mounting: Designed for standard 35mm DIN-rail mounting or direct screw mounting.
Replacement: Directly replaces KTA7-25S units. If you are replacing an older unit, your existing accessories (like auxiliary contacts) may need to be verified for compatibility with the KT9 series.
Accessories: Supports a wide range of snap-on accessories including front/side mount auxiliary contacts, shunt trips, and undervoltage releases.
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