About Sprecher+Schuh
Industrial Control Relays & Motor Starter Solutions
Sprecher + Schuh, founded in 1903 in Aarau, Switzerland, is a trusted global manufacturer of industrial control and protection solutions for machinery, motors, and process automation. The company, headquartered in Houston, Texas, with 2,500 employees worldwide, delivers a comprehensive range of low-voltage contactors, relays, overload protection devices, push-buttons, terminals, and integrated motor-control systems to industries spanning manufacturing, construction, HVAC, and heavy equipment.
The Sprecher + Schuh product portfolio includes CA series contactors (CA5 to 900HP, CA6 to 700HP, CA7 to 75HP, CA8 miniature versions, CA9 to 1150HP industrial drives), CS series industrial control relays with identical physical design to CA contactors for system modularity, RZ series electronic timing relays offering 19+ timing functions and ranges from 0.05 seconds to 60 hours, and CEP/CT overload relays for thermal protection.
All contactors and relays are manufactured to IEC 60947 international standards and tested for mechanical durability (switching cycles in the millions), electrical integrity, and coil reliability across wide temperature ranges. Designs emphasize modularity—auxiliary contact blocks, mechanical interlocks, and suppression modules stack onto base units, allowing customers to configure exact control requirements.
Applications span standard motor starts, reversing-duty control (forward/reverse contact blocks), soft-start integration, variable-frequency drive (VFD) interface, and safety-critical circuits where redundancy and fail-safe operation are essential. Sprecher + Schuh also manufactures push-button stations, indicating lights, and terminal blocks to create complete control cabinets.
ChatMRO connects control engineers, panel builders, and maintenance technicians instantly with the right Sprecher + Schuh control component—specify motor horsepower, control voltage (120/240VAC standard, 24VDC for safety-critical), and function (contactor, timing relay, overload, or complete motor starter), and our AI surfaces compatible devices with certified performance and lead times from our indexed 30M+ component database.
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Frequently asked questions
What's the difference between CA and CS series devices in a Sprecher + Schuh control cabinet?
CA series are power contactors that switch main motor current; CS series are control relays that switch low-current signals and logic circuits. They share identical physical design and mounting, so building mixed CA/CS logic is modular and efficient. Power contactors must handle full motor inrush current; control relays handle only signal circuits (100mA or less).
How do I prevent coil burnout when controlling a contactor with 24VDC supply?
Use a 24VDC-rated coil version of your selected contactor (e.g., CA7-24DC). The coil is wound with fewer turns of thicker wire optimized for 24VDC, not 120/240VAC. Applying 120VAC to a 24VDC coil will cause rapid burnout. Always specify control voltage explicitly when ordering—mismatches are common and catastrophic.
What's the purpose of mechanical interlocks in reversing motor starters?
Mechanical interlocks physically prevent simultaneous operation of forward and reverse contactors, which would short-circuit the power supply. Interlocks are essential safety features—removing them for any reason creates electrocution and equipment-damage hazards. Never bypass or disable mechanical interlocks, even temporarily.
Can I stack auxiliary contact blocks onto an existing Sprecher + Schuh contactor, or must I replace the entire unit?
Yes—auxiliary blocks (both normally-open and normally-closed) snap onto the base contactor frame, adding signaling capability without replacing the main device. This modularity is a key Sprecher + Schuh advantage. However, some very old models may not accept blocks; consult technical documentation for your specific contactor series.
How do I select the correct overload relay setting (Class 10/20/30) for my motor?
Class 10 trips within 10 seconds at 1200% of rated current (fast protection, preferred); Class 20 trips within 20 seconds; Class 30 (slowest) is for motors with high starting current. Most NEMA-design motors need Class 10 or 20. Consult your motor datasheet for starting current, then select overload class that avoids nuisance trips during startup while protecting against sustained overload.