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Electronic Circuit Breakers (ECBs)

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

WAGO’s ECBs have a lot to offer:

They reliably protect against overload and short circuits.
They also enable the activation of high-capacitance loads of 50,000 μF and more, without increasing the rated current setting.
One-, two-, four- and eight-channel models and current ratings of 0.5 to 12 A offer you the flexibility you need for setting the rated current to suit your individual application.
With a maximum width of 45 mm (1.772 inches), these ECBs feature high channel density to save space in the control cabinet.
Some devices are also available with active current limitation, preventing the power supply unit from overloading during a short circuit.

News

New Product

Protect Small Currents Easily

New WAGO 0.5 A Electronic Circuit Breaker

With WAGO’s single-channel circuit breaker (787-2861/050-000), even small load currents of 0.5 A can now be easily protected in control circuits. Quick, reliable tripping after 4 ms is guaranteed with all seven available circuit breakers. In addition, the circuit breaker saves space in the control cabinet or system distribution box with its overall width of just 6 mm. Different control options for the integrated digital input allow channels to be set to a specific state, increasing usability. The digital output reports the current status. Since they have the same profile, direct commoning of the input and output voltages is possible across 857 and 2857 Series devices.

The Benefits for You:

Protection of load currents from 0.5 A to 8 A
Slim 6 mm (0.236 inch) housing saves space
Reliable tripping of the circuit breaker after just 4 ms

Discover More Electronic Circuit Breakers

Single-Channel Electronic Circuit Breakers (ECBs)

The new modules are just 6 mm (0.236 inch) wide, making them the slimmest ECBs currently available on the market. They are approximately 66 % smaller than miniature circuit breakers, saving even more space, particularly when used in control cabinets. These ECBs allow high-capacitance loads greater than 50,000 μF to be switched on – helping you reduce false tripping due to inrush currents.

The Benefits for You:

24 VDC; six versions available for rated currents of 1 to 8 A
Devices color coded according to rated current
An extremely slimline design
Switch-on capacity: > 50,000 µF
Wide surrounding air temperature range: −25 … +70 °C (−13 … +158 °F)
Resetting, on/off switching directly on the module or remotely via digital input signal
Triggered signal output – can also be commoned as a group signal for up to 30 devices
Approvals: CE, UL 61010, UL 2367

2-, 4- and 8-Channel ECBs

WAGO’s space-saving ECBs provide reliable protection with a superior price–performance ratio. They offer both outstanding features and reliable protection against overload and short circuits. With a maximum width of 45 mm (1.772 inches), these ECBs feature high channel density to save space in the control cabinet.

The Benefits for You:

Two-, four- and eight-channel protective switch with currents adjustable from 0.5 to 12 A
High switch-on capacity: > 50,000 µF
Communication capability: remote monitoring and reset
Optional active current limitation
Approvals: CE, UL 60950, UL 2367, GL

The Benefits of WAGO’s ECBs for You

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 detecting hazardous ground faults in control circuits and switching them 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?

Thermal

Possible applications:

Low-voltage, high-power and DP fuses
High overcurrents required for fast tripping

Explanation:

In the example: ten-fold overcurrent (related to fuse nominal current): Tripping within a range of 30 ms (best case) or 200 ms (worst case)
Only two-fold overcurrent: tripping within a range of 2 s (best case) or >100 s (worst case).

Thermal and Magnetic

Possible applications:

Found in circuit breakers or motor protection switches
High overcurrents required for fast tripping

Explanation:

In the example: three- to five-fold overcurrent for B-characteristic and AC operation, additional safety factor: 1.2 or 1.5
Thus, in the worst case scenario, a tripping current of 7.5 times the nominal current is necessary.

Electronic

Possible applications:

Precision setting options
Reaction within a short time – even with low overcurrents
Protection of long cable runs and small cross sections possible

Explanation:
ECBs ensure reliable protection, even at low overcurrents and with long cable lengths.

How Does an ECB Function?

The ECB checks whether 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. Trip time depends on the magnitude of the overcurrent. The measurement of the output current, the processing and calculation of the tripping time and the actuation of the semiconductor switch are performed by a microprocessor that monitors one or more output channels. The corresponding tripping times can be found in 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 – with precision, speed and repeatability
Selectivity, especially with ECBs with active current limitation
Remote operation via digital input and output
Fast and reliable communication via IO-Link protocol, signal contact, potential-free signal or Manchester protocol
Advantageous installation size and width, for example, eight output channels in just 42 mm (1.653 inch), which saves 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

Communication

Communication 1.0
Digital Signaling (S/P)

The electronic circuit breaker can be reset via digital control signal. The 787-2861 ECB can also be switched on and off with this control signal. A digital output signal indicates the status of the channel or the sum of the channels for 787-166x ECBs. For some devices, this signal is potential-free (P).

Communication 2.0
Manchester Protocol (M)

The PLC transmits a coded pulse pattern to control input S1. The ECB synchronizes itself automatically. The current status of all output channels is transmitted back simultaneously via signal output S2. The edge change is interpreted as “high” or “low.” For each channel, both status and voltage/current values can be transmitted individually.

Communication 3.0
IO-Link (I)

Via an IO-Link interface implemented in COM3, for each channel, both its status and its voltage and current values can be transmitted individually. The nominal output current can also be configured via this interface if the device's rotary switch is set accordingly. The IO-Link cyclic communication is much faster than the Manchester protocol.

Your contact person at WAGO

WAGO Türkiye

Tatlısu Mahallesi Arif Ay Sok No 6 34774 Ümraniye - İstanbul

Additional service offerings:

Compatible with Our ECBs

Efficient Power Supplies

Constant supply voltage at any time − worldwide, in the widest range of applications. That’s what makes WAGO’s power supplies so successful!

Discover Our Other Product Ranges

Electrical Interconnections

For fast, secure, maintenance-free connections: WAGO is your partner for all conductor types. Our product selection runs from rail-mount terminal block systems, to installation and field-wiring terminal blocks, to pluggable connectors and feedthrough components, to PCB connections and marking solutions.

Automation Technology

Measurement, control, regulation: WAGO’s automation technology and associated software are future-ready and save time. Our I/O systems, controllers, displays and panels are distinguished by the highest level of reliability – even under extreme conditions.

Electronic Circuit Breakers (ECBs)

New Product

Protect Small Currents Easily

Discover More Electronic Circuit Breakers

Single-Channel Electronic Circuit Breakers (ECBs)

2-, 4- and 8-Channel ECBs

The Benefits of WAGO’s ECBs for You

Why Secondary-Side Fuse Protection?

What Types of Fuse Protection Are There?

Thermal

Thermal and Magnetic

Electronic

How Does an ECB Function?

ECB Advantages

Communication

Communication 1.0Digital Signaling (S/P)

Communication 2.0Manchester Protocol (M)

Communication 3.0IO-Link (I)

WAGO Türkiye

Tatlısu Mahallesi Arif Ay Sok No 6 34774 Ümraniye - İstanbul

Additional service offerings:

Compatible with Our ECBs

Efficient Power Supplies

Discover Our Other Product Ranges

Electrical Interconnections

Automation Technology

Communication 1.0
Digital Signaling (S/P)

Communication 2.0
Manchester Protocol (M)

Communication 3.0
IO-Link (I)