3 Reasons to Use an Electronic Circuit Protector

| Scott DeVost

Electric Circuit Protector

Protect Your 24 Volt Loads

In this post, we’ll go through three reasons why you should protect your 24 volt DC loads with an electronic circuit protector (ECP).

#1. The Product is Designed for 24 Volt DC

1694 Electronic Circuit ProtectorThe Bulletin 1694 electronic circuit protector from Rockwell Automation® is designed to work and protect 24 volt DC loads. It provides better protection for the loads because it has been designed specifically for this purpose. The electronic circuit protector can sense a fault quicker than a fuse or a miniature circuit breaker. Because the 24-volt power supply may not be able to provide the infinite current that is typically needed for a circuit breaker or a fuse to sense a short circuit, the trip may take longer. In an overload condition between 100 and 130 percent, the circuit breaker will take an extended amount of time before it trips, which may result in equipment damage. Fuses and circuit breakers were designed to work in higher voltage AC conditions, but some may also be used in DC applications. They were not designed specifically for DC voltage like the electronic circuit protector. 

#2. Class 2 Protection

Class 2 protection is a requirement for many sensors and safety components. The requirement is on the product label or manual. Article 725 of NFPA® 70 requires that low voltage DC circuits have a maximum power potential limited to 100VA. The National Electrical Code (NEC) doesn’t consider using a fuse or miniature circuit breaker to limit to 100VA as acceptable, and not all 100VA or fewer power supplies are rated as Class 2 protection devices. Using the 1694 electronic circuit protector with the Class 2 option will not limit the selection of the power supply to a class 2 only to provide the class 2 protection. You can also use a larger power supply and distribute the power to your class 2 loads as needed. Below is information from the user manual for the Allen Bradley® 450L light curtains.

“To comply with UL restrictions, GuardShield™ safety light curtain sticks are powered by DC sources whose secondary circuits are isolated from the primary circuit by double insulation of reinforces insulation. The DC power supply must satisfy the requirements for Class 2.”

#3. Reset and Monitoring 

The ability to reset after a fault is a feature that the electronic circuit protector shares with a circuit breaker. The electronic circuit protector also has a multicolor LED that will allow you to visually inspect if the load is ON (green), close to an overcurrent condition (yellow), or tripped (red). The LED is also a button that allows you to re-set the device.

Electronic Circuit Protection LED Options

Are Ready to Try an Electronic Circuit Protector?

These are just three reasons why you should consider using the new Allen-Bradley 1694 electronic circuit protector (ECP) to protect your 24 volt DC loads. To learn more about the benefit, contact us today!

All images are © Rockwell Automation