> >
>

# Miniature Plug-in Relay, simple wiring diagram

#1
07-24-09, 03:32 AM
Member
Join Date: Jun 2009
Location: Rochester Hills. MI
Posts: 42
Miniature Plug-in Relay, simple wiring diagram

Type R – Miniature Plug-in Relay
and Wiring Diagram

http://stevenengineering.com/Tech_Su...Fs/45RGENR.pdf

first wiring diagram has
inputs 1 & 5
output 9
coil 13 , 14

When the coil is energized,
Is this diagram saying
In order to see voltage at the output

voltage must be applied to both inputs 1 & 5
or
voltage must be applied to one or the other of the inputs ?

#2
07-24-09, 03:39 AM
Member
Join Date: Oct 2008
Location: New England
Posts: 10,524
Hi Mark, What the diagram is telling you is which contact is the normally closed and which is the normally open. 9 is the common contact and with no energy applied to the coil 9 and 1 are connected. Apply energy to coil and 9 transfers to 5 and 9 to one opens. This allows you to turn something on or off when the coil is energized. Does this help?

Bud

Last edited by Bud9051; 07-24-09 at 03:41 AM. Reason: text
#3
07-24-09, 07:38 AM
Member
Join Date: Jul 2008
Location: Kingston, PA
Posts: 137
Mark - as Bud mentioned, energizing the coil will change the internal connection of the relay from 9 & 1 to become 9 & 5.

The verbage "normally closed" and "normally open" refer to the state of the contacts with the relay in the "on-the-shelf" state. That means the relay coil is NOT energized, just as it would be sitting in it's box up on the shelf.

Terminal/contact 9 is called the COMMON terminal.

Terminal/contact 1 is called the "normally closed" contact, a.k.a. NC or N/C, because the path between 9 and 1 is closed, or connected, when the relay is in the normal on-the-shelf state (NOT energized).

Terminal/contact 5 is called the "normally open"contact, a.k.a. NO or N/O, because the path between 9 and 5 is open, or NOT connected, when the relay is in the normal on-the-shelf state (NOT energized).

Usually the switched power or signal wire is connected to the COMMON terminal (#9 in your case) and the wire(s) going to whatever you want to do by energizing or de-energizing the relay are connected to 1 and 5. You can use either NO or NC, or both depending on what you want to do.

In wiring schematics, if the schematic shows this:
--||--, this represents wires connected to NO contacts (in your case 9 & 5)

If it shows this:
--|/|--, this represents wires connected to NC contacts (in your case 9 & 1)

Last edited by williswires; 07-24-09 at 07:42 AM. Reason: edited text
#4
07-24-09, 08:36 AM
Member
Join Date: Jun 2009
Location: Rochester Hills. MI
Posts: 42
Thanks Willis & Bud
It's all clear now. I'm ordering the relay now
You fellows have been great