Here’s what more than 2,500 business decision-makers around the world say.Download the report
...with the Facility Hero app in hand! Discover how you can optimize your maintenance efforts today.Learn more
Access tailored services, 24/7 self-service and expert help. Anywhere, anytime, any project.Discover now
Everything you need to know about our IoT technology backbone.Learn more
Explore our global offerings or select your country from one of our five regions.Global
Découvrez nos offres globales ou sélectionnez votre pays dans l’une de nos cinq régions.
Goals and Symptoms
When, How, Which surge suppressors to implement.
Facts and Changes
Causes and Fixes
- When to implement surge suppressors :
If the LED is exposed to high voltage, short term spikes such as those created when large coils are de-energised ( solenoids, large contactor etc.) then damage may occur to the circuitry, causing a premature failure of the device. This damage can also occur where the inrush to the coil is high.
The catalogue characteristics state that where the pilot light is fitted directly in parallel across an inductive coil, the inrush of the coil must not exceed 30VA. Remember that the inrush of the coil is usually very high compared to the nominal power consumption.
If this value of 30VA is exceeded, then a suppressor block must be used in conjunction with the pilot light. It is also advisable to fit suppression across the inductive load to reduce the back emf produced.
- How to implement surge suppressors :
Connect the suppressor in parallel with the LED block.
- Which surge suppressors to implement :
ZBVJ* and ZBVB* => mostly used on 12Vdc or 24Vdc, the inductive loads are generaly low. However it is recommended to implement a freewheel diode. You can use the ZBZG156 which includes a diode.
ZBVG* (110...120Vac) => Use ZBZVG (maximum power of coil 120VA).
ZBVBG* (24...120V ac/dc) and ZBVM* (230Vac) => Use ZBZVM (maximum power of coil 230VA).
For coils with a power above the suppressors limitation, use a dedicated suppressors on the coil itself:
Freewheel diodes for DC applications.
Bidirectionnal diodes or varistors for AC applications.
Sign up for all the latest solutions, offers and best practices straight to your inbox.
We are excited that you have joined the group. You will receive your welcome email soon describing the program and what to expect in the upcoming weeks. Enjoy!