About the Solid state relay heating radiator CX-C
The Solid state relay heating radiator CX-C is part of the ELEHPD Relay Heatsink range. What type of radiator does solid state relay or modules should be equipped with? Actually,there is no fully consistent relationship between them,because the heating power of solid relay or modules mostly related to the actual load current of the driven,but not the rating. Design formula of Heating: 1.Heating=actual load current(A)×1. ELEHPD manufactures and exports low voltage electrical products from Yueqing, Zhejiang, China, supplying distributors, panel builders, M&E contractors and OEM buyers worldwide.
Typical applications
- Motor control centres and pump or fan starters
- Machine building, conveyors, packaging and CNC equipment
- HVAC control panels and building automation
- Water treatment, irrigation and pumping stations
- Panel retrofits replacing electromechanical control gear
How to specify the right Relay Heatsink
- Size the contact rating for the inductive load, not just the resistive current (AC-3 duty for motors)
- Check the coil voltage and frequency available in the panel: 24 V DC, 110 V, 230 V or 400 V AC
- Confirm the auxiliary contact count needed for the control and indication circuit
- Match the enclosure rating to the environment (IP20 inside a panel, IP65 on the machine)
Specifications
solid state relay heating radiator CX-C
What type of radiator does solid state relay or modules should be equipped with? Actually,there is no fully consistent relationship between them,because the heating power of solid relay or modules mostly related to the actual load current of the driven,but not the rating. Design formula of Heating:
1.Heating=actual load current(A)×1.5W/A The formula applicable for single solid state relay,single AC booster modules and Rseries of solid state relay.but for three-phase solid state relay and three-phase AC booster modules,the actual load current is the blanket of three-phase actual load current.
2.Heating =actual load current(A)×3.0W/A
The formula applicable for single fully controlled modules.
The fuction of radiator is to emanate the heat produced by solid state relay or modules,but in fact,it is difficult to choose a radiator size.because the effect of radiator effect for reference:the temperature of motherboard must below 80℃.so in practical application,a 75℃temperature switch(with normally closed contact)can be installed in the mounting surface which near to the edge(20mm)of solid state relay or modules.
When choose a radiator,besides these factors,it should also think about the size of solid state relay whether can it suit for the radiator or not.and radiator install space in the machine must be considered too.Finally must ensure the temperature of motherborad of solid state relay or modules of below 80℃in the worst condition.
Overall dimensions
| Type | C-80 | C-115 |
| Length×width×height(mm) | 80×80×70 | 115×100×50 |
| Scope of application | Applicable for single phase industry solid state relay of below 80A | Applicable for single phase industry solid state relay of below 120A |
Frequently asked questions about the Solid state relay heating radiator CX-C
What is the difference between a contactor and a relay?
A contactor is built for switching power circuits repeatedly at high current, often with motor duty ratings (AC-3) and arc-suppressing chambers. A relay switches control signals at low current. In practice: contactor for the motor, relay in the control circuit that drives the contactor coil.
How do I calculate the correct contactor size for a motor?
Use the motor's full-load current, apply the AC-3 rating for the operating voltage, and allow for the number of starts per hour. As a rule of thumb, the contactor's AC-3 rating should be at least equal to the motor FLC, then step up one frame if the duty is heavy.
Do you supply the coil voltage I need?
Coil voltages are specified per order. Send the model number, coil voltage and frequency you require and we will confirm availability and lead time.
Are auxiliary contacts included?
Base models come with the standard auxiliary contact configuration for that frame. Add-on auxiliary blocks and mechanical interlocks can be quoted with the contactor.
Further reading
