This is a new, out of packaging, never used E-T-A breaker with MOSFET-based internals. 500mA trip.

Electronic circuit protector type ESX10 is designed to ensure selective
disconnection of DC 24 V load systems.
DC 24 V power supplies, which are widely used in industry today, will
shut down the output in the event of an overload with the result that
one faulty load in the system can lead to complete disconnection of
all loads. As well as an unidentified failure this also means stoppage
of the whole system.
Through selective disconnection the ESX10 responds much faster
to overload or short circuit conditions than the switch-mode power
supply. This is achieved by active current limitation. The ESX10 limits
the highest possible current to values between 1.3 to 1.8 times the
selected rated current of the circuit protector. Thus it is possible to
switch on capacitive loads of up to 75,000 µF lamp loads, but they
are disconnected only in the event of an overload or short circuit.
For optimal alignment with the characteristics of the application the
current rating of the ESX10 can be selected in fixed values from
0.5 A...12 A. Failure and status indication are provided by a multicolour
LED and an integral short-circuit-proof status output or a potential-free
signal contact.
The ESX10, with a width of only 12.5 mm, can be plugged into the
E-T-A power distribution socket Module 17plus ensuring ease of
installation and saving space in control cabinets.
Upon detection of overload or short circuit in the load circuit, the
MOSFET of the load output will be blocked to interrupt the
current flow. The MOSFET and the load circuit may be re-activated
via the remote electronic reset input or manually by means of the
ON/OFF button. When starting up the

Circuit Breakers 
Electronic Circuit Protector - ESX10 - selective disconnection of DC 24 V load

Product Category: Circuit Breakers 
Manufacturer: E-T-A Circuit Breakers 
RoHS: RoHS Compliant Details 
Series: ESX10 
Product: Circuit Protection Devices 
Current Rating: 500 mA 
Voltage Rating DC: 24 VDC 
Illuminated: Not Illuminated 
Brand: E-T-A 
Height: 80 mm 
Maximum Operating Temperature: + 50 C 
Minimum Operating Temperature: - 25 C 
Mounting Style: DIN Rail 
Product Type: Circuit Protector 
Factory Pack Quantity: 1 
Termination Style: Screw 
Width: 12.5 mm