ZSX-3 Flash and signal relay

Structure and principle

2.1 structure
The device adopts JK-11K,H and Q-type standardized shell components, and has three structural forms of embedded rear wiring (JK-11K), protruding rear wiring (JK-11H) and protruding front wiring (JK-11Q), which can be optional.See the appendix for its outline, installation hole size and terminal diagram.

2.2 Working Principle
The device consists of transformer, rectifier bridge, JRC-10m small sealed electromagnetic relay, capacitor, resistor and led.See Fig.1 for the wiring diagram of the principle.
When the terminal, is connected to ac 220V,50Hz power supply, when the water level rises to make ○,○(the water level electrode) forms a path, the electromagnetic relay K acts, the moving closing contact closes, and the device sends out a signal.

Technical conditions

3.1 Rated voltage
The rated voltage of the device is 220V ac,50Hz

3.2 action value
The operating voltage of the device shall not exceed 85% of the rated voltage. 

3.3 Action time
At rated voltage, the operation time of the device is not more than 50ms.

3.4 Power consumption
At rated voltage, the power consumption shall not be greater than 3VA.

3.5 Coil heating
When the ambient temperature is 40℃, the device coil shall be able to withstand 1.1 times of the rated voltage for a long time and the temperature rise shall not exceed 60K.

3.6 Contact performance
In the DC inductive load circuit (GL 10 GL 20xLGLJDq 7=5ms±0.75ms) with voltage no more than 220V and current no more than 0.4a, the contact disconnection capacity is 30W. 

3.7 Dielectric strength
The insulation between the housing and non-charged metal parts of all circuits of the device shall be able to withstand 2000V (effective value), 50Hz AC voltage, lasting for 1 minute without breakdown or flashio phenomenon.