“Auto Reset” without latching mode. This mode is determined by terminals pins 9 & 11 left open. The output relay is energised when the monitored current rises above the selected set level, set via the front potentiometer. The output relay will de-energise when the current falls back below the level selected less the set hysteresis adjustable 5 to 50%, set via a second potentiometer. For example set level at 4 Amps, hysteresis at 30% will result in energisation at 4 Amps and de-energisation at 2.8Amps. If the auxiliary supply is lost at any time the relay will also de-energise.
“Manual Reset” without latching mode. This mode is determined by a wired link between terminals pins 9 & 11. The output energises when the monitored current rises above the level selected via the front potentiometer. Once energised the relay will remain latched even if the monitored current falls below the set level less any selected hysteresis. Resetting is achieved by opening the link between terminals pins 9 & 11 or by removing the auxiliary supply. If whilst resetting the monitored current is still above the set level a reset will not be achieved. It is normally preferable in the latching mode to have the adjustable hysteresis set at minimum.
“Auto Reset” without latching. This version is only possible as an “auto reset” device and the output relay acts in an “inverse” way, i.e. the output relay is normally energised and de-energises when the monitored current rises above the level selected via the front potentiometer. It will re-energise when the monitored current falls below the set level less the set hysteresis adjustable 5 to 50%, set via a second potentiometer. It should be noted that on first connection of the auxiliary supply the relay will energise for 0.1 secs (i.e. current below the set level), whilst the scanning circuit is determining the level of current being measured. This time can be extended up to 10 secs via the adjustable “start up delay” thus allowing a longer stablization period.
Use of Current Transformers
The three current ranges are determined by wiring to different terminals. For monitoring currents above 10 Amps AC a current transformer is required. It is recommended that preferably a 1 Amp secondary current transformer is used and connected to the 50mA to 1 Amp input range, thus giving 100% resolution. A range of 1 Amp secondary CT’s are available from our CT section.
Adjustable Initial Start Up Time Delay
The current relays have an adjustable 0.1-10 sec initial start up delay timer, activated by the connection of the auxiliary supply, therefore if a control circuit is going to be permanently live the time delay will only ever be active once. In this scenario it may be preferable to use the versions 11WRIA5A, 11WRID5A (over current relays), 11WRIA5C, 11WRID5C (under current relays), these versions have a time delay that activates every time a monitored current exceeds or falls below the set levels.
DC Auxiliary Supply Versions
DC auxiliary supply versions are as standard non isolated. For these versions the supply and the measured current must be isolated from each other and must not exceed 50V DC. On request at extra cost isolated versions can be manufactured utilising internally a DC to DC converter.
Supply & Measuring:
Nominal supply tolerance: ±15%
Isolation AC versions: Via transformer
Isolation DC versions:
No as standard
Yes via optional internal DC to DC converter
Power consumption: 3VA max
Hysteresis: Adjustable 5 to 50% of le
±2% at constant ambient
±5% across temperature range
100 mSec on make
200 mSec on break
Input ranges selectable:
5-100mA (max overload 5A for less than 1 sec)
50mA-1A (max overload 17A for less than 1 sec)
0.5-10A (max overload 55A for less than 1 sec)
100mA range 1 Ohm
1A range 0.1 Ohm
10A range 0.01 Ohm
Output contacts: SPCO 10Amps/250V AC1
Mechanical life: 30 Million ops
Electrical life: 200K ops at max rated load
Operating temperature: -20°C to +65°C
Storage temperature: -20°C to +65°C
CE marked: Yes
In accordance with:
Housing material: Polycarbonate, Auto extinguishable to UL 94 V-0
11WRIA (11 pin AC current)
11WRID (11 pin DC current)
11WRIA/I (11 pin AC current inverse output)
11WRID/I (11 pin DC current inverse output)
* No isolation on DC versions as standard, on request at extra cost isolated versions are available.
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