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Circuit Breakers and Supplemental Protection Devices

Technical Tips & FAQs
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Circuit Breakers and Supplemental Protection Devices
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
    • Control Relays & Timers
    • Control Relays & Timers
    • Pilot Devices
    • Pilot Devices
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    • Signaling Solutions
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    • Terminal Blocks
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    • Power Supplies
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    • Electrical Industry Codes
 
 
Sprecher & Schuh Series L9 D Curve 2 amp 3-Pole miniature circuit breaker
Using A 3 Pole L8 Or L9 Device On A 1 or 2 Pole Load

Can you use a 3 pole L9 breaker on a 1 or 2 pole load?
Can you use a 3 pole L8 breaker on a 1 or 2 pole load?
Can I use just 2 of 3 poles from L9-10/3/C (2 phases from 3 phase lines) 1st and second pole?

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Sprecher & Schuh Series L9 circuit breaker with L9-AMRA and L9-AMRS3 side mount auxiliary contacts
L9 Circuit Breaker Auxiliary Contacts Vs. Signal Contacts

What is the difference between Auxiliary Contact L9-AMRA3 and a Signal contact block L9-AMRS3?

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L8 And L9 Trip Curves And Trip Times On DC Applications
Sprecher & Schuh Series L9 trip curves as illustrated in 2018 ecatalog
L8 And L9 Trip Curves And Trip Times On DC Applications

Are there trip curves and documentation for trip times when using L8 UL1077 supplemental protectors or L9 circuit breakers in DC applications?

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High efficient AC industion motor name plate from manufacturer
Troubleshooting Nuisance Tripping Of Molded Case Circuit Breakers

The increased use of high efficieny motors requires a closer look at specifications when applied to circuit protection methods. Not considering all of the factors can lead to specification errors and nuisance tripping or worse.

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Sprecher & Schuh methods of apply circuit protection
Methods Of Applying Protection Devices

Which protection devices are best for your application? Where do they fit in the schematic of your panel?

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UL489 Miniature Circuit breakers for branch circuit protection up to 63 amps.
Applying UL1077 Circuit Protectors Per UL And NEC Guidelines

How to design for and apply supplementary protectors in accordance with UL & NEC guidelines.

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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 rules define which components in a control panel require a short circuit current rating.

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Wohner Ambus fuse holder dual led fuse indicator close up
How Does A Dual LED Blown Fuse Indicator Work?

Indicators on fuse holders and terminals form a parallel path with the fuse they are monitoring. Dual LED indicators may not necessarily utilize both LEDs to indicate a blown fuse.

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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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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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