Technical Information
Applications for Type B RCDs
The National Electrical Code of India (SP 30:2023) mandates the use of type B RCDs for the following applications
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1. Inverters, battery storage and un-interuptable power supply (UPS) systems.
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2. Variable frequency drives (VFDs), including elevators and escalators.
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3. Electric vehicle supply equipment (EVSE).
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4. Solar photovoltaic (PV) arrays.
Inverters, battery storage and (UPS) systems.
VFDs, including elevators and escalators
EVSE
Solar PV
Frequently Asked Questions
​​What is the difference between an RCD and RCCB? ​
The term RCD and RCCB are often used interchangeably, however RCD is an umbrella term that covers RCDs, RCCBs, CBRs and MRCDs, RCCBs refer to a particular RCD- the residual current operated circuit breaker without integral overcurrent protection. See more.​
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What are the different types of RCDs?​​
There are four types of residual current devices classified according to their operation in response the presence of DC components and frequencies other than the rated frequency- Type AC, Type A, Type F & Type B. See more.
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What is the difference between an ELCB and RCD?
"ELCB" refers to obsolete voltage operated earth-leakage circuit breakers, whereas RCDs refer to residual current devices.
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What does "NK" or "SK" mean when mentioned on a part number?
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What does "HD" mean when mentioned on a part number?
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What does the "G" symbol printed on the RCCB mean?
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