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Modular Protection Devices FAQs

Which type of MCB should one use for any home application?
The type of MCB used depends on the load. For resistive load one must use B Curve MCB’s like geysers, irons. For slightly inductive loads use C Curve MCB’s like fans, fridge etc and for inductive loads with high inrush current use D Curve MCB’s like UPS, small motors etc.
Are Hager MCB’s Line Load reversible?
Yes Hager MCB’s are Line Load reversible.
Are RCCB’s suitable for short circuit protection?
No RCCB’s are meant for only protection against shock or fire and not for Short Circuit protection.
How does one identify whether and RCCB has tripped due to fault?
Hager RCCB’s have a unique feature of having a yellow indication incase the tripping is due to an Earth Fault.
How does one protect a house incase of overvoltage?
Hager offers a unique protection devices MZ209 / MZ215 / MZ216 which offer protection against persistent over voltage.
Which RCCB / RCBO to use for protection against shock?
IEC 61008 / 61009 clearly lay down guidelines, that for human protection 30mA RCCB’s must be used for protection against shock.
Which enclosures are to be used for indoor use and for outdoor use?
For indoor use IP42 / IP43 enclosures can be used and for outdoor IP54 / IP65 enclosures can be used.
For commercial applications like UPS / computers, which RCD’s are to be used?
We recommend use for HI (highly immunized) RCD’s for protection when the application has high harmonic content or has high %age of pulsated DC component. Hi type RCD’s give accurate performance against Blinding and Nuisance tripping.
What is the meaning of ROHS?
ROHS means “Restricted use of Hazardous Substances”. Hager ensures that all its solutions have minimum impact on the environment and comply to ROHS.
How to select a surge protection device?
The selection of surge protection devices depends on the area of installation and the distance of the installation from the source. Type 1 surge protection devices are used for protection against surges due to lighting and Type 2 are used for protection against switching transients.