Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

MCB after or before relay

Status
Not open for further replies.
kallileo

kallileo

Electrical
Jul 8, 2012
23
GR
Usually an MCB or fuse is place before the relay.
What will change I place first the relay and after that the MCB like in diagram B?

 
Replies continue below

Recommended for you

Sort by date Sort by votes
Diagram 'A' looks correct. An MCB downstream of the relay offers limited protection to the relay, where upstream it offers full protection if correctly sized.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Irwanto
  • Locked
  • Question
reverse power relay
Replies
1
Views
78
che12345
che12345
kaspor
  • Locked
  • Question
Guideline required for MFAC relay
Replies
7
Views
38
che12345
che12345
Tamer Mansour
  • Locked
  • Question
Control Relay overheat
Replies
9
Views
45
RRaghunath
RRaghunath
Shivam Maury
  • Locked
  • Question
Why Fuse is not breaking but MCB is braking.
Replies
4
Views
15
RRaghunath
RRaghunath
james64
  • Locked
  • Question
MLO(Main Lug Only) vs MCB(Main Circuit Breaker) 4
Replies
9
Views
54
davidbeach
davidbeach

Part and Inventory Search

Sponsor

Back
Top