ESS22-TA-001-DC24V-4A ETA Electronic circuit breaker

The ESS22-T device extends the "Electronic circuit breakers" product group for DC 24 V applications. This is a two-pole version with galvanic isolation. The ESS22-T therefore fulfils the requirements of the Machinery Directive 2006/42/EC and the associated standard EN 60204-1 "Safety of machinery, electrical equipment of machines", section 9.4.3.1

The combination of active electronic current limitation in the event of a short circuit and an overload cut-out from 1.1 x IN provides selective, two-pole protection for DC 24 V load circuits. The ESS22-T can be snapped directly onto the top-hat rail and therefore offers quick and flexible installation for device groups with several DC 24 V circuits that are supplied by switched-mode power supplies or transformer power supplies.

DC 24 V switched-mode power supplies are used very frequently in automation technology. However, in the event of an overload, they regulate the output voltage that is to supply all connected loads. If a fault occurs in a single load in the system, the voltage in all other load circuits also drops. This often results not only in an undefined fault state, but also in the machine or system coming to a standstill.

This is precisely where the ESS22-T intervenes by reacting faster than the switching power supply to the overload condition. The maximum possible overcurrent is always limited to typically 1.4 times the selected rated current. This makes it possible to switch on capacitive loads up to 20,000 μF, but it only switches off in the event of an overload or short circuit. The rated current is available in fixed values of 0.5 A...10 A to adapt to the load conditions. Operating and fault states are indicated by a visual display and via signal contacts. Remote operation is optionally possible via an electrically isolated control input.

The manual ON/OFF switch directly on the device allows targeted commissioning of individual load circuits. As soon as the ESS22-T detects an overload or short circuit in its load circuit, it blocks the load output transistor and thus interrupts the current flow in the faulty circuit; in addition, the load output is galvanically isolated on two poles by a mechanical switching element. Once the fault has been rectified, the load output of the ESS22-T is reactivated manually by pressing the ON/OFF switch directly on the device or optionally via the galvanically isolated reset input or via the control input.


Key features:

• Two-pole electronic circuit breaker with galvanic isolation at the load output
• "LOAD+ path" 2-fold protected with electronic fuse and failsafe element
• "LOAD- path" 2-fold protected with electronic fuse and failsafe element
• Selective load protection, electronic switch-off characteristic
• Active current limitation when switching on capacitive loads up to 20,000 μF, DC motors and in the event of overload/short circuit
• Rated current selectable in fixed current levels 0.5 A...10 A
• Operating voltage monitoring for undervoltage
• Manual on/off switch (ON/OFF) on the device
• Option: Galvanically isolated control input for ON/OFF
• Option: Galvanically isolated reset input RE
• Visual signalling via multicoloured LED
• 2 signal contacts (NC contact and NO contact) Width 22.5 mm
• For direct top-hat rail mounting

Technical data:

Approvals: