Used but tested as working fine
Izumi Denki Corporation
Now known as IDEC
Made in Japan
Timed Power Relay
Type: RTM-SP2N
Timer range: 0 ~ 12 Seconds (user adjustable)
240V AC Coil
DPDT ** See my notes below about the switching
Contacts rated at 5A 240V AC or 700mA 100V DC
Supplied with an IDEC Octal socket (DIN Mount compatible or surface mount)
Socket is type: 8R2P-04F
COSMETIC CONDITION:
Clean undamaged relay case and octal base
Relay contacts bright and no "pitting" from arcing
TESTING:
Coil is 2.8K Ohm
Activation voltage 240V AC
Very positive, audible "clunk" when operated
Checked all points of the DPDT switch contacts - no problems at all
Switching information:
One set of contacts (SPDT) are just like any other standard relay, apply power and the contacts changeover. However in addition to this, another set of contacts (SPDT) are controlled by a cam which in turn is controlled by a motor running at 240V 50Hz.
The front of this relay assembly has a knob/scale arrangement where the user can select any interval in the range of 0 ~ 12 seconds.
When power is initially applied to the relay, the timer starts, the timer contacts activate (changeover).
After the user determined time period has passed, the timer contacts return to their rest state BUT the "standard relay contacts" remain in the powered on state until power is removed.
So in essence, one set of contacts is under direct control of the voltage being applied but the other set are ONLY activated for the time period set by the user.
There is an electrical diagram on the relay casing which helps explain which pin has which connection (pins 2 & 7 are always AC power to the coil, leaving 6 pins for the relay contacts)
Visual indicators:
The front panel of the relay assembly does indicate power ON and Timer period completed using fairly faint neon lamps (a bit hard to see when they are on quite frankly)
When the timer (the motor) is active, a small red pointer gradually returns to zero - at which point the timer section has finished it's job.
While the timer is winding back to zero, you can hear a soft whirring from the motor - nice audible feedback.
When AC power is removed from the relay coil, the timer automatically resets back to the user selected time interval, ready for another "countdown"
I have tested the DC resistance of all the relay contacts and everything is fine.
Since testing I have now packed this timer relay with socket in sealed plastic
