Inventory Reduction Program
The Following Standard Products have been entered into the Inventory Reduction Program at reduced rates as of 01/27/2026 Material Number PLANT Quantity Special...
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3VA MCCB – COMPONENT REQUIREMENT FOR COMMUNICATION CAPABILITY
Question: What components are needed to enable communications for the 3VA breaker? Answer: To enable Modbus TCP/IP (Default Protocol) at minimum the following is...
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Checklist : Padmount Transformers
Dry Type and Liquid Filled Padmount Transformers. When requesting a price from MAP (Mixed Apparatus Pricing) specifications and a one line is required. If you do not...
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Checklist : Unit Substation Transformers
Dry Type and Liquid Filled Unit Substation Transformers. When requesting a price from MAP (Mixed Apparatus Pricing) specifications and a one line is required. If you...
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Checklist : Metal Enclosed Switchgear
Metal Enclosed Switchgear When requesting a price from MAP (Mixed Apparatus Pricing) specifications and a one line is required. If you do not have specifications and a...
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3RW4 Combination Testing
3RW4 Combination Testing Question: Customer is looking to use a circuit breaker on a 3RW404* in a UL application for protection. They are not finding the...
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Where can I find time-current curves for WL circuit breakers?
The Time Current Curves (TCC) for WL circuit breakers can be obtained from the Siemens EZ TCC software program. EZ TCC is a free download. Additionally, Siemens has...
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Can a WL circuit breaker be reverse fed?
UL standards such as UL 489 and UL 1066 mandate that if a circuit breaker is not suitable for reversed line and load connections, the products must be marked "LINE"...
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Why doesn't the WL circuit breaker trip when I push the TEST button at bottom of trip unit?
This is the internal self-test function of the trip unit functions. Test can be done with or without tripping the circuit breaker. To test without tripping, press...
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Which short-time delay (tsd) scale do we use for in and out settings from coordination study?
Circuit breaker test reports and coordination study reports often use the terms “IN” and “OUT” when referring to short-time or ground fault delay settings. When the...
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