ESS30-S002-DC24V-8A - ETA Electronic circuit breaker

The ESS30-S electronic circuit breaker with galvanic isolation is a "Low Energy Breaker", the world's only electronic overcurrent protection for DC 24 V applications. For use in decentralised and central power supply units, it meets the requirements of DIN EN 60934, UL 1077 as a supplementary protector and UL 1310 as a "Class 2 power unit" (NEC class2). The compact device is designed for pluggable mounting on the 17plus and 18plus base systems and the SVS power distribution systems and guarantees quick and easy installation.
The ESS30-S is just 12.5 mm wide and selectively protects all DC 24 V load circuits. This is achieved by a combination of active electronic current limitation in the event of a short circuit and an overload cut-out at typ. 1.2 x IN. DC 24 V switched-mode power supply units are used very frequently in automation technology. In the event of an overload, however, 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 also drops in all other load circuits. This often results not only in an undefined fault condition, but also in the machine or system coming to a standstill.
The maximum possible overcurrent is always limited to 1.2 times the selected rated current (see Table 1). This makes it easy to switch on capacitive loads up to 40,000 μF. The rated current is available in fixed values of 0.5 A...10 A and in the adjustable variants 1 A/2 A or 3 A/6 A.
Operating and error states are indicated by a multi-coloured LED and integrated signal outputs. The manual ON/OFF switch directly on the device allows targeted commissioning of individual load circuits and resetting after overcurrent-related switch-offs.

Key features:

• Pluggable on power distribution modules 17plus, 18plus and SVSxx

• Galvanic isolation in the event of a fault

• Active linear current limitation

• Capacitive loads up to 40,000 μF

• Fixed rated currents 0.5 A...10 A (0.5A...3.6A NEC Class 2)

• 2 stages (1 A/2 A or 3 A/6 A) adjustable via switch on the device

• Approvals: UL, NEC Class 2, VDE

• Reduces storage costs as one device covers 2 rated currents

• Offers high flexibility thanks to pluggability and simple adjustment of the rated currents

• Saves costs, as the devices up to 3.6A with UL1310 (NEC Class 2) approval replace the expensive switching power supplies intended for this purpose

• Saves energy costs thanks to 1/3 lower power loss than comparable solutions

• Increases system availability thanks to clear fault detection and signalling

Technical data:

Approvals:

Table 1: Voltage drop, current limitation, max. load current