Phoenix Contact Electronic Circuit Breaker - CBM - 2905744
Best current price£271.61from Tameson UK
Best offers
Shopping.co.uk recommended and popular offers
Tameson UK£271.61Visit shop Phoenix Contact Fuse Clamp - 2905744
Visit shopTameson UK£271.61Visit shop One Offer
1 offer from £271.61
View price history by clicking the chart icon.
Used Offers
3 offers from £136.30 - £188.06
View price history by clicking the chart icon.
eBayPhoenix Contact Circuit Breaker CBM E8 24DC/0.5-10A NO-R 2905744
£25.29 delivery
£136.30
Visit shop
Phoenix Contact Circuit Breaker CBM E8 24DC/0.5-10A NO-R 2905744£25.29 delivery£157.82Visit shop →
PHOENIX CONTACT 2905744 ; CBM E8 24DC/0.5-10A NO-R ELECTRONIC CIRCUIT BREAKER Ne£22.50 delivery£188.06Visit shop →
Product Information
Full details
The Phoenix Contact 2905744 is an electronic circuit breaker designed for protecting multiple 24V DC loads from overloads and short circuits. It is ideal for industrial control panels and automation systems requiring reliable, modular protection. A key benefit is its active current limitation, preventing damage to sensitive components. However, its compact design may require careful planning for wiring in densely populated enclosures.
All features
| Series | CBM |
|---|---|
| Model Part Number | 2905744 |
| Brand | Phoenix Contact |
Extended Product Information
FAQs
What is the maximum total current this device can handle?
The device has eight channels, each adjustable from 0.5A to 10A. The total current depends on the individual settings for each channel, but ensure the power supply can handle the aggregate load. The device itself is designed for 24V DC applications within these per-channel limits.
Can this circuit breaker protect AC loads?
No, this electronic circuit breaker is specifically designed for 24V DC applications only.
How do I adjust the nominal current for each channel?
Each channel has a dedicated adjustment dial. Rotate the dial to set the desired nominal current level between 0.5A and 10A for that specific channel.
What does 'active current limitation' mean?
Active current limitation means the breaker actively controls and restricts the current flow in the event of an overload or short circuit, providing a faster and more precise response than traditional thermal-magnetic breakers, especially for capacitive loads.
What is the IP rating and what does it signify?
The IP20 rating signifies that the device is protected against solid objects greater than 12.5mm (like fingers) but offers no protection against water ingress. It is suitable for dry, indoor industrial environments.
How do I reset the circuit breaker after a trip?
Most electronic circuit breakers of this type reset automatically once the fault condition is removed. If a specific channel tripped due to overload, removing the overload or fault and allowing a brief moment should permit it to return to its operational state.
What is the purpose of the N/O contact?
The N/O (Normally Open) contact is a dry contact that can be wired to a PLC, alarm system, or indicator light. It closes when the circuit breaker is operating normally and opens if any channel trips, providing remote status feedback.
Troubleshooting
Device does not power on or no load is active.
Verify that the 24V DC power supply is correctly connected and providing voltage. Check that the input terminals are securely fastened. Ensure the nominal current for the affected channel is set higher than the load's operating current.
Circuit breaker trips frequently on a specific channel.
The load current may be exceeding the set nominal current. Verify the load's actual current draw. If the current draw is consistently higher than the set nominal current, increase the nominal current setting (if within safe limits for the load) or investigate the load for faults. Check for potential short circuits.
Remote signaling contact is not functioning.
Ensure the remote signaling (N/O) contacts are correctly wired to your monitoring system. Verify that the circuit breaker is in an active state (not tripped). If the breaker is tripped, the N/O contact will remain open.
Device feels excessively hot during operation.
Ensure adequate ventilation around the device. Check that the sum of the nominal currents for all active channels does not exceed the device's overall capacity. If the heat is significant and the unit is not overloaded, contact support.
Pros and Cons
Pros
- Provides reliable protection for multiple 24V DC circuits.
- Active current limitation protects sensitive equipment.
- Modular and expandable design simplifies system integration.
- Compact form factor saves space on DIN rails.
- Remote signaling capability enhances system monitoring.
Cons
- Requires a 24V DC power supply.
- Initial setup may require precise current setting.
- IP20 rating means it's not protected against water ingress.
- Suitable for indoor industrial environments only.
Setup, Compatibility & Care
Setup:
- Mount the circuit breaker securely on a standard DIN rail.
- Connect the 24V DC power supply to the input terminals.
- Connect each of the eight loads to their respective output channels.
- Set the desired nominal current for each channel using the adjustment dials. The nominal current assistant can help in this process.
- Connect the remote signaling contact (N/O) to your monitoring system if required.
Compatibility:
- Voltage: Requires a stable 24V DC power supply.
- Current: Each channel can be set between 0.5A and 10A.
- Mounting: Compatible with standard 35mm DIN rails.
Care:
- Ensure the device is powered off before any maintenance.
- Keep the ventilation slots clear of dust and debris.
- Clean the exterior with a dry or slightly damp cloth. Avoid harsh chemicals or solvents.
- Periodically check connections for tightness and signs of wear.