Phoenix Contact CBM E4 24DC/0.5-10A NO-R Circuit Breaker

CBM E4 24DC/0.5-10A NO-R: four-channel electronic circuit breaker for 24 V DC loads

The Phoenix Contact CBM E4 24DC/0.5-10A NO-R (order no. 2905743) is a four-channel electronic circuit breaker from the CBM range, built for 24 V DC control circuits that need finer current steps and more installation flexibility than the CBMC series. Each channel is adjustable to 0.5, 1, 2, 4, 6 or 10 A, which allows very light loads such as a single sensor to be protected close to their real current. The code reads CBM for the family, E4 for four electronic channels, 24DC for the voltage, 0.5-10A for the range, NO for the N/O signalling contact and R for the reset input. The housing is 41 mm wide and 130 mm high, larger than the CBMC modules, and it offers a wider ambient temperature range and marine-related data.

Seven Star LLC supplies it as an independent supplier in Muscat for projects in Oman and the GCC.

Technical specifications of the CBM E4 24DC/0.5-10A NO-R

How the CBM E4 24DC/0.5-10A NO-R protects each output channel

The CBM E4 uses a two-stage characteristic. Above about 1.3 times nominal current it trips quickly, typically in 20 ms, while currents of 1.1 to 1.3 times nominal are tolerated for about 30 seconds, which lets loads with start-up peaks run without nuisance trips. During an overload, the module limits the current actively to about twice nominal on the 0.5 and 1 A settings and about 1.5 times nominal on 2 to 10 A. After a trip, the channel waits 10 seconds. A nominal current assistant, indicated by yellow-green flashing, helps you find a suitable setting from the real load.

The DC OK LED reports supply status: green in the 16.5 to 30 V range, yellow for undervoltage below 15.8 V, red for overvoltage above 30.5 V. A reset input allows an external signal to re-enable tripped channels, and the status output can feed a PLC when any channel exceeds 80 % load.

Where the CBM E4 24DC/0.5-10A NO-R fits in a 24 V DC system

Typical use is behind a 24 V DC supply on a heavy-duty control panel, protecting PLC supply, I/O, sensors, actuators and communication gear individually. The reset input suits central panels where a controller or push-button must restore tripped branches, and the 70 °C rating and altitude data make it attractive for harsh conditions. If you need simpler wiring with no reset input, the CBMC E4 24DC/1-10A NO (2906032) is the smaller option; the CBMC E4 24DC/1-4A NO (2906031) covers lighter loads, and the IO-Link type 2910411 adds digital communication.

Selection and ordering checklist

• Confirm each branch current is covered by the discrete steps 0.5, 1, 2, 4, 6 or 10 A.
• Check that the supply stays above 16.5 V DC during normal operation.
• Decide whether a reset signal (7 to 30 V DC) and the status output will be wired.
• Check capacitive loads against the 75000 μF per channel limit.
• Confirm the requirement for DNV GL or hazardous-location (Class I Div 2) data as shown on the datasheet.
• Check the 41 mm width and 130 mm height against the available rail space.

Installation, commissioning and maintenance

Install on a 35 mm DIN rail, connect the supply to the push-in IN terminals and each load to an OUT terminal. Connect the optional reset and status wiring according to the terminal markings. Begin commissioning with the lowest setting and use the nominal current assistant on each channel, then lock settings. Observe the vibration data: the datasheet quotes 5 to 24.9 Hz with 1.6 mm amplitude and 24.9 to 150 Hz at 4 g, which suits equipment with moving machinery.

Maintenance is mostly visual: read the DC OK and channel LEDs, check the remote contact and verify the reset function during periodic tests. Keep a spare for critical panels because replacing the module is fast, but the setpoints must be re-entered.

Typical applications in Oman and the GCC

In Oman and the GCC, the 70 °C operating limit and G3 corrosive-gas listing make this module a candidate for compressor stations, offshore and coastal installations, desalination plants and power-generation auxiliaries. Where marine or offshore requirements apply, the datasheet lists DNV GL data for this device, but the project documents must still be checked against the exact class rules. The tolerance for short current peaks suits pumps, valves and contactor coils with inrush.

Comparison with sibling devices

Information to send with an RFQ

• Full part number and quantity.
• Branch currents and any inrush data.
• Supply unit and minimum voltage.
• Whether DNV GL or Class I Div 2 documentation is needed.
• Panel temperature and altitude.
• Delivery location and date.

Documents and quotation

Send us the part number CBM E4 24DC/0.5-10A NO-R and the quantity you need, and we will confirm which official documents are available for this device. Seven Star LLC is an independent supplier in Muscat and quotes for projects across Oman and the GCC; we do not act on behalf of the manufacturer.

Please also tell us the delivery location and required timeline so that availability can be checked before you commit to a project schedule.