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Motor Controllers & MCCBs

Technical Tips & FAQs
Motor Controllers & MCCBs
Motor Controllers & MCCBs
Technical Tips & FAQs
Tech Tips
    • Contactors
    • Contactors
    • Overload Protection
    • Overload Protection
    • Starters & Enclosed Products
    • Starters & Enclosed Products
    • Motor Controllers & MCCBs
    • Motor Controllers & MCCBs
    • Softstarters
    • Softstarters
    • Circuit Protection
    • Circuit Protection
    • Disconnect Switches
    • Disconnect Switches
    • Rotary Cam Switches
    • Rotary Cam Switches
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    • Control Relays & Timers
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    • Pilot Devices
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    • Signaling Solutions
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    • Terminal Blocks
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    • Power Supplies
    • Electrical Industry Codes
    • Electrical Industry Codes
 
 
Sprecher & Schuh KTA9-32S marking label location
Method Of Marking/Tagging The KT_9 Motor Controllers

Are there any snap-in marker cards or adhesive label options to tag the KT_9 products?

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Sprecher & Schuh Series KTU7-40H-3D 3 Pole molded case circuit breaker with handle in the tripped position
KT_9 Handle Stops At Or Below Trip Position When Breaker Is Turned Off

Why does my motor controller handle not turn completely to the off position?

Read Now
 
 
Short circuit and thermal protection all in one device
Using KT_7-25S/25H/45H Controllers On Non-Motor/Resistive Loads

Can a KT_7-25S/25H/45H controller be used a branch circuit protection on non-motor or resistive loads like a heater?

Read Now
 
Sprecher & Schuh Series CL7-43-A10 front auxiliary position
KT7 Front Mount Vs. Side Mount Auxiliaries

What is the maximum voltage rating of KT7 front mounted auxiliary contacts verses side mounted auxiliaries. How do these differences effect KT7 assembled devices, such as E-Combo starters?

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Sprecher & Schuh illustration of a variable frequency drive
Use Of KT7 Motor Controllers With Variable Frequency Drives

A motor branch circuit including a variable frequency drive and one or more KT7 Motor Controllers is a complex system. Successful performance depends on all components, devices and their interconnections. Several key points must be considered when using KT7 devices with VFDs.

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Manual motor controllers UL tested and suitable for a variety of circuit control and protection needs
What Is The Replacement For KTA3-100 Motor Controllers?

I have a KTA3 in my multi-motor control panel. What is the replacement? What are the alternatives to KTA3 Motor Controllers? KTA3-25 controllers transitioned to KT4 or KT7 controllers. KTA3-100 controllers were replaced with KT7 controllers, but only up to 45 amps.

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Sprecher & Schuh Series KF7 Fuse holders installed in a custom control panel
What Are KF7 Fuse Holders Used For?

KF7 fuse holders can be applied on the line side of KTA7 or KTC7 motor circuit controllers and matching CA7 contactors. KF7 can also be connected on the line side of a CA7 contactor and/or starter as you would a standard fuse holder. This can increase a panels KAIC rating.

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Sprecher & Schuh Series KTU7 molded case circuit breakers mounted on KTU7-D-DB busbar
KTU7 Molded Case Circuit Breaker Busbar Alternatives

KTU7 busbar can be used on both KTU7 and KT7 motor controllers, but KT7 busbars cannot be used on KTU7 MCCBs. What are some alternatives when assembling multi-motor starter panels?

Read Now
 
Short circuit and thermal protection all in one device
How To Specify A Disconnect, Short-Circuit & Overload Device In One Unit

Proper selection of motor controllers for self-protection relies on the motor FLA, and the motor HP. Choosing based solely on motor FLA can cause problems.

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cURus Logo
Short Circuit Current Ratings (SCCR) And Control Circuits

Do the components in a control circuit have a short circuit current rating? UL and NEC rulses define which components in a control panel require a short circuit current rating.

Read Now
 
Manual motor controllers UL tested and suitable for a variety of circuit control and protection needs
Converting KTA3-25 To KT4 Motor Controllers

My panel uses a KTA3-25 motor controller. What is the replacement for this device? KT4 Manual Motor Controllers are a direct replacement for KTA3-25 controllers with only a few exceptions.

Read Now
 
Sprecher & Schuh Series KF7 Fuse holders
How To Choose The Right KT7 Busbar Power Wiring System

There are several different types of bus bar systems available. How do I know which system to choose for my assembly? If I have an old bus bar system, what is the current replacement recommendation? What if I need to add a unit to an existing system?

Read Now
 
Sprecher & Schuh Series KT7 motor controller and KT7-SHS handle Assembly
Installing KT7 Handles In An Extra Deep Enclosure

When I mount KT7 in a deep enclosure the shaft seems to droop and miss the handle mechanism. What do I do?

Read Now
 
Sprecher & Schuh test image of internal contact of KTA3 after a short circuit
Can Components Be Reused After A Short-Circuit?

Unlike the fuse box in most residential power centers, industrial circuit protection can rarely be reused after a short-circuit. Some products are specifically tested by UL to withstand a short circuit.

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Motors attached to pumping equipment in a plant facility
The Big Motor And A Little Motor Rule

A little known rule of UL inspectors outlines what protection should be used in multi-motor starter panel applications.

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Sprecher & Schuh Series KTA7 motor controller, KTU7 molded case circuit breaker, and L9 circuit breaker
How To Specify Motor Circuit Breakers

A variety of products can be used to perform as a circuit breaker for motor and non-motor loads, but some perform better than others.

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Preassembled, Enclosed and Ready To Go
Door Interlock Mechanisms On CX7 KWIKstarters

CX7 KWIKstarters are UL508 approved because they have a removable cover instead of a hinged door. Rules specifically outline the difference between a cover and a door.

Read Now
 
Sprecher & Schuh Series KT7 Spacer KBH2
Using Bus Bars In Multi-Motor Starter Panels

When mounting multiple motor controls in a multi-motor panel, using bus bars is an efficient use of space. Installing the right bus bar for the job can make a big job simple.

Read Now
 
Sprecher & Schuh diagram showing Wye connection with 480 and 277 volt sides
Wye Power Vs. Delta Power Systems

What is the meaning of a delta connected system versus wye connected power systems when applied to motor controllers and circuit breakers?

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Open or enclosed, combination starters include a means of disconnect in fusible, non-fusible, or molded case circuit breakers, up to 500 HP @ 460V
The Importance Of Primary Fuses In Enclosed Circuit Controllers

Most panels without control transformers are ordered without any “optional” control circuit fuse, which can leave the control circuit wiring unprotected.

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Short circuit and thermal protection all in one device
Methods Of Applying KT7 Motor Controllers

Proper design and compliance with UL/CSA and NEC standards for motor controllers and circuit breaker devices.

Read Now

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