One Source - Complete 24 VDC Power Solution
E-T-A Circuit Breakers is pleased to announce the availability of the SMP single and three-phase switch-mode power supplies.
The addition of the SMPs to the product offering allows E-T-A to offer customers a single source for their 24 VDC control system that includes:
- Switch-mode power supply
- Power circuit protection
- Control circuit protection
How does the combination of SMP and overcurrent protection work?
The 4230-T thermal-magnetic MCB protects the primary AC protection of the power supply unit and/or for its supply lines. Single pole and three pole versions are available, depending on the power supply.
The second part of the selective load protection is provided by an electronic overcurrent protection device with active linear current limitation. The overcurrent protection devices (ESX10-, ESX10-T, ESS30 and ESS31-T) are available with and without physical isolation and can be individually specified based on the application. An electronic protection device is required because only limited power is available in the event of an overload when using switch-mode power supplies. The max. power factor is only 1.5 times rated current. In theory, this would be exceeded in the event of an overload. The power supply turns down the output voltage to self-protect itself.
In this case, selective load protection means that the electronic overcurrent protection device responds quicker to the overload condition than the power supply. This means: Before the voltage of the power supply unit drops, the electronic circuit protector limits the max. current flow via active linear current limitation and prevents the entire supply from overloading.
24 VDC Power Solution Components
Single Phase Switch-Mode Power Supplies
Three Phase Switch-Mode Power Supplies
Power Circuit Protection
4230-T Thermal-Magentic MCB
Control Circuit Protection
ESX10 Electronic Circuit Protector
ESX10-T Electronic Circuit Protector
ESS30 Electronic Circuit Protector
ESS31-T Electronic Circuit Protector