When it comes to dependable motor control in industrial and commercial applications, the Sprecher + Schuh KTA7-25S DOL Motor Starter stands out as a compact, enclosed, and efficient solution. Combining short-circuit, overload, and manual control in a single housing, this device has become an essential component for engineers and maintenance professionals who value performance, safety, and reliability.
What is the Sprecher + Schuh KTA7-25S DOL Motor Starter?
The Sprecher + Schuh KTA7-25S DOL Motor Starter is a Direct-On-Line (DOL) starter designed to control and protect motors up to approximately 15 HP. It integrates a manual motor controller, short-circuit protection, and overload protection into a single IP65-rated polycarbonate enclosure, offering both convenience and compliance with international safety standards.
With its built-in Type E self-protected combination starter certification, it eliminates the need for upstream fuses or breakers in many installations. This not only reduces wiring complexity but also enhances cost-efficiency and space utilization.
Key Features of the Sprecher + Schuh KTA7-25S DOL Motor Starter
Rugged IP65 Enclosure for Harsh Environments
The Sprecher + Schuh KTA7-25S DOL Motor Starter comes housed in a durable, non-metallic IP65 enclosure (approx. 149mm H x 127mm D x 89mm W). This design provides complete protection against dust and water jets, making it ideal for outdoor, washdown, and industrial environments.
Through-Door Rotary Handle for Direct Operation
The through-door rotary handle offers clear ON/OFF position indication and allows operators to manually start and stop motors safely. The padlockable handle enhances operator safety, complying with lockout/tagout (LOTO) standards to prevent accidental energization during maintenance.
Integrated Short-Circuit and Overload Protection
The KTA7-25S features a current-limiting magnetic trip mechanism that reacts within milliseconds, limiting fault currents up to 65 kA @ 480V or 47 kA @ 600V. Additionally, its Class 10 thermal overload protection ensures motor safety from overcurrent and phase loss conditions, with adjustable trip settings to match specific motor requirements.
Compact, Space-Saving Design
With a 45mm-wide frame and DIN-rail mount compatibility, the Sprecher + Schuh KTA7-25S DOL Motor Starter offers a compact footprint. It integrates the functions of a circuit breaker, overload relay, and manual starter—reducing panel space and simplifying system layout.
Safety and Visual Indication
The high-visibility red/yellow or black/grey handle options make it easy to distinguish between standard ON/OFF control and emergency stop applications. When used as an emergency OFF switch, the red/yellow handle provides quick visibility during critical situations.
Technical Specifications
The Sprecher + Schuh KTA7-25S DOL Motor Starter is engineered for versatility and compliance with both UL and IEC standards. Here’s a detailed look at its specifications:
|
Specification |
Description |
|
Motor FLA Range |
Adjustable from 0.1A to 25A |
|
Voltage Rating |
Up to 600VAC (50/60Hz) |
|
Horsepower Rating |
Up to 15 HP (11kW) @ 480V 3Ø |
|
Short-Circuit Capacity |
65kA @ 480V / 47kA @ 600V |
|
Overload Trip Class |
Class 10 (Trips within 10 seconds at 6x rated current) |
|
Protection Type |
UL Type E Self-Protected Combination Starter |
|
Environmental Rating |
IP65 (Enclosure) / IP20 (Device) |
|
Operating Temperature |
-20°C to +60°C |
|
Mounting Type |
DIN Rail or Base-Mounted |
|
Handle Type |
Through-door, padlockable (Red/Yellow or Black/Grey) |
These specifications make the KTA7-25S a dependable choice for direct-on-line motor applications where robust protection and straightforward manual control are required.
Compliance and Certifications
The Sprecher + Schuh KTA7-25S DOL Motor Starter is fully certified to meet major international standards, ensuring safe and compliant operation in global industrial environments.
● UL 508 & CSA C22.2 No.14 Certified: Recognized as a Manual Motor Controller and Type E Self-Protected Combination Starter.
● IEC 60947-2 & IEC 60947-4-1: Compliant with international standards for circuit breakers and motor starters.
● CE Marked: Meets EU Low Voltage Directive requirements.
● RoHS & ISO 9001: Environmentally safe and manufactured under strict quality management standards.
● Type 2 Coordination: Offers coordination with downstream contactors under fault conditions.
This level of compliance highlights Sprecher + Schuh’s commitment to safety, reliability, and engineering excellence.
Alternative Models and Series Variants
While the KTA7-25S remains one of the most versatile enclosed motor starters in its class, Sprecher + Schuh offers several alternatives and successors for specific application requirements:
1. KTA7-25H High Interrupting Version
The KTA7-25H model offers enhanced breaking capacity (up to 100kA) for installations that demand higher short-circuit ratings.
2. KTA7-32S and KTA7-45H for Larger Motors
For motors requiring higher full-load currents, the KTA7-32S supports up to 32A (25HP @ 480V), while the KTA7-45H handles up to 45A (40HP @ 460V), providing extended power coverage.
3. Specialized Series: KTC7, KTB7, and KTV7
● KTC7 Series: Designed for motors with high inrush currents.
● KTB7 Series: Magnetic-only protectors (no thermal trip).
● KTV7 Series: Optimized for VFD-driven motors and multi-motor setups.
4. Enclosure Options
Different enclosures are available to match environmental demands:
● -VG: NEMA 4/4X/12 polycarbonate enclosure (corrosion-resistant)
● -FG: Fiberglass-reinforced polyester enclosure for heavy-duty use
● -DG / -WG: Painted steel enclosures for indoor and watertight applications
● -EX / -EY / -EZ: Explosion-proof options for hazardous locations
5. Next-Generation KT9 Series
The KT9 series is the modern evolution of the KT7 line, offering improved fault capacity, expanded current range (up to 80A), and upgraded thermal design. However, the KTA7-25S continues to be widely used for both new installations and retrofits.
Typical Applications of the Sprecher + Schuh KTA7-25S DOL Motor Starter
The Sprecher + Schuh KTA7-25S is used in a wide range of applications that demand reliability, compact design, and safety compliance:
Pumps and Fans
Ideal for water pumps, HVAC systems, and blowers, this starter ensures localized control and protection against overload and short-circuit conditions.
Compressors and Conveyors
Used in air compressors, conveyor belts, and mixers, it delivers consistent operation even in industrial environments where safety and uptime are priorities.
Machine Tools and OEM Equipment
Commonly integrated into OEM-built machines like packaging systems, saws, and small presses, the KTA7-25S functions as both a main power disconnect and a safety shutoff.
Multi-Motor Panels
In multi-motor installations, Type E starters like the KTA7-25S simplify panel design by removing the need for individual fuses per motor, saving both space and cost.
Maintenance and Retrofits
Due to its all-in-one design, the KTA7-25S DOL Motor Starter is a preferred choice for retrofitting outdated motor starters or replacing separate overload relays and breakers.
Why Choose the Sprecher + Schuh KTA7-25S DOL Motor Starter?
Here’s why electrical engineers, maintenance teams, and OEM designers choose the Sprecher + Schuh KTA7-25S DOL Motor Starter:
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Compact Design: Combines multiple protection and control features in one enclosure.
-
UL Type E Certification: Eliminates the need for external circuit protection in most installations.
-
High Fault Tolerance: Withstands up to 65kA short-circuit currents.
-
Versatile Mounting: DIN rail or base mount installation.
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Operator Safety: Lockable rotary handle meets international lockout/tagout standards.
-
Environment-Ready: IP65-rated enclosure ideal for dust, water, and outdoor exposure.
Related Product Collections ➜
Explore related product categories from Industrial Electrical Warehouse that complement the Sprecher + Schuh KTA7-25S DOL Motor Starter:
1. Motor Starter ➜
Browse a complete range of motor starters, including enclosed, DOL, and soft starters, designed to control and protect electric motors efficiently.
2. Motor Control Equipment ➜
Discover essential motor control devices—contactors, relays, disconnects, and controllers—for industrial automation and electrical systems.
3. Power Distribution ➜
Find dependable power distribution components that support system protection, load management, and efficient energy flow in industrial settings.
Conclusion: Reliable, Compact, and Built for Safety
The Sprecher + Schuh KTA7-25S DOL Motor Starter offers everything modern facilities need for dependable motor control: durability, safety, and easy integration. Whether used in pumps, compressors, conveyors, or machine tools, it delivers superior protection and long-term reliability.
If you’re seeking a robust and efficient motor starter that meets international standards and simplifies system design, explore the Sprecher + Schuh KTA7-25S DOL Motor Starter and discover how it can enhance your motor protection strategy.
