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Electronic Circuit Breakers (ECBs)

High switch-on capacity combined with an electronic relay – WAGO's space-saving ECBs come into play when the focus is on both safety and a top price-performance ratio.

WAGO's Space-Saving Electronic Circuit Breakers

WAGO's EPSITRON® ECBs have a lot to offer in the way of performance and features. They not only provide reliable protection against overloading and short circuiting, they also enable activation of high-capacity loads of 50,000 microfarad and higher – without having to increase the nominal current setting. One, two-, four- and eight-channel models with 0.5–12 A current ratings offer you the flexibility you need for setting the nominal current for your individual applications. With a maximum width of 45 mm, WAGO's ECBs feature high channel density, providing space-saving installation in the control cabinet. Some devices are also available with active current limitation, preventing the power supply unit from overloading during a short circuit.

We would be pleased to advise you on electronic circuit breakers!

2-, 4- and 8-Channel Electronic Circuit Breakers

2-, 4- and 8-Channel Electronic Circuit Breakers

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1-Channel Electronic Circuit Breakers

1-Channel Electronic Circuit Breakers

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Advantages of WAGO's Electronic Circuit Breakers:

Alternativer Text
+ Easy Wiring

Easy Wiring

Bridgeable signal output and total reset for up to 30 devices

+ Many Configuration Options

Many Configuration Options

Optional nominal current setting 1 … 8 A and seven different configuration options for the digital measurement output

+ Trip Characteristics

Trip Characteristics

Reliable, rapid, and precise disconnection in case of overcurrent or short circuit

+ Save space in the control cabinet

Save space in the control cabinet

Optimum space utilization in control cabinets – up to 8 channels in just 42 mm module width

+ Industry's most compact

Industry's most compact

Width of just 6 mm (0.23 inch) maximizes panel space

+ Simple optical differentiation of the variants

Simple optical differentiation of the variants

Color coding of devices according to rated current

+ Rotary Switch

Rotary Switch

Nominal current can be individually adjusted in six steps for each channel; transparent, sealable and markable cover

+ Marking


Device identification via WMB Markers or TOPJOB® S Marking Strips

+ Communication


Digital input and output for diagnostics and remote control or for transmitting the current state of set or actual current values

+ Intuitive Status Indication

Intuitive Status Indication

Each output channel has backlit buttons for operating status indication, switching on/off and acknowledgement

Why secondary-side fuse protection?

On the secondary side, switched-mode power supplies provide DC voltage to control circuit loads (e.g., controllers, operating panels, displays and auxiliary relays). These control circuits also call for wiring protection and if the load has no protective unit of its own, device protection as well. Furthermore, Machinery Directive EN 60204 requires the detection of hazardous ground faults in control circuits and switching off within five seconds.

The overcurrent protection in primary switched-mode power supplies reacts very quickly to overcurrents on the output side. Selective protection of individual current paths in the secondary circuit via fuses or conventional circuit breakers is often ineffective, if the power supply cannot deliver a brief overcurrent.

What types of fuse protection are there?

  • For example, as found in low-voltage high-power and
    DP fuses
  • High overcurrents required for fast tripping
Picture example:
10-fold overcurrent (related to the fuse nominal current):
Tripping within range 30 ms (best case) or 200 ms (worst case)

Only 2-fold overcurrent: Tripping within range 2 s (best case) or > 100 s (worst case)

Thermal and Magnetic
  • Found in circuit breakers or motor protection switches
  • High overcurrents required for fast tripping
Picture example:
3 … 5-fold overcurrent for B-characteristic and AC operation, additional safety factor:
1.2 or 1.5
Thus, in the worst case a tripping current of 7.5 times the nominal current is necessary.
  • Ensure precision settings
  • Reaction within a short time – even at low overcurrents
  • Protection of long cable runs
    and small cross sections
Electronic circuit breakers (ECBs) ensure reliable protection, even at low overcurrents and long cable lengths.

How does an ECB function?

The ECB verifies that the output current is greater than the nominal current. As soon as the output current exceeds the nominal current, the output is electronically switched off by a semiconductor switch. The trip time depends on the magnitude of the overcurrent. The measurement of the output current, processing and calculation of the tripping time, as well as actuation of the semiconductor switch are performed by a microprocessor that monitors one or more output channels. The corresponding tripping times can be taken from the graph on the right.

ECB Advantages

  • Switch off secondary-side overcurrents and short circuits – even with long cable runs and small conductor cross-sections – precisely, fast and repeatedly
  • Selectivity, especially with ECBs having active current limitation
  • Remote operation via digital input and output
  • Readout functions (communication) through serial data transfer via digital input and output
  • Beneficial installation size and width, for example, 8 output channels in just 42 mm (save more than 70% of installation space compared to miniature circuit breakers)
  • Nominal current assignable for each channel
  • Satisfy EN 60204-1 requirements for dependably switching off ground faults after five seconds (see right)


Many reasons for our electronic circuit breakers in five short videos

Questions? Would you like to know more about our electronic circuit breakers?

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Platzsparende elektronische Schutzschalter für Anwendungen, die neben Sicherheit ein Top-Preis-/Leistungsverhältnis erfordern.
Model: Elektronische Schutzschalter
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