October 21, 2009 - E-T-A Circuit Breakers announces the ESX10-T Solid State Overcurrent Protector is CSA approved for installation into Class I, Division 2 - Group A, B, C, and D applications. The compact device combines purely electronic trip characteristics and active current limitation to allow selective disconnection of loads connected to 24VDC power supplies. Selective load protection prevents complete shutdown of the system by quickly disconnecting the faulty path when an overload or short circuit occurs.Active current limitation allows the ESX10-T to respond much faster to overload or short-circuit conditions than the power supply.
It limits the highest possible current to 1.3 to 1.8 times the rated capacity and is capable of switching on capacitive loads up to 20,000 µF - with disconnection only in the event of an overload or short circuit.
Conventional protective elements cannot manage this as they either respond too slowly or are susceptible to nuisance tripping due to inrush currents.Upon detection of an overload or short circuit in the load circuit, the power-MOSFET switching output of the ESX10-T interrupts the current flow at 1.1 times rated current after 3 seconds. Failure and status indication are provided by a multicolor LED and status output signal.
Specifications and Approvals
E-T-A’s ESX10-T Solid State Overcurrent Protector is just 2.76 inches high by 0.5 inch wide and allows direct mounting on a 35 mm din rail consequently simplifying installation and saving cabinet space. The ESX10-T is approved to CSA “CLASS 2258 02 - PROCESS CONTROL EQUIPMENT - For Hazardous Locations - Class I, Division 2, Groups A, B, C, D”.
It is available in fixed current ratings from 0.5 – 12A and has a Class I, Division 2 ambient temperature range of 0ºC - 40ºC.
Applications
Typical applications for the ESX10-T include automation systems (e.g., machine tool, packaging machines) and Process control systems (Petro/Chemical, Pharmaceutical, Food and Beverage, etc.) where selective disconnection is vital and an integral safety technology exists, such as a safety PLC or a similar system.
