The Benefits of Electronic Circuit Protectors in NEC Class 2 Circuits

Many machines and systems for the North American market must use components that are approved according to UL standards are expected. UL1310, which is a standard for Class 2 power supplies, is one of these important standards.

What is a Class 2 circuit according to the National Electrical Code (NEC)?

The NEC has defined special requirements for safe low voltage circuits and categorizes circuits into different classes. In this case, Class 2 refers to category 2 circuits. Article 725-121 of the NEC requires that applications with a voltage limit of 42 volts be used to eliminate the risk of electrical shock. Additionally, the article requires the elimination of potential fire hazards by limiting the circuit's maximum power potential to 100 VA or 8 A within specified time limits.

When should a Class 2 circuit to be used?

For circuits with loads, that are applicable for machines and systems with UL approval and that use a Class 2 power supply. Typical loads are often sensors.

Benefits for the User:

Complying with NEC Class 2 doesn't have to mean oversized power supplies or complex current-limiting measures. With E-T-A’s UL1310- and UL2367-approved electronic protectors you can:

• Use Standard 24VDC Power Supplies Replace expensive Class 2 SMPS units—our devices limit output current at the load, ensuring power-limited circuit compliance.
• Save on Conductor Sizing and Enclosure Space - Class 2 circuits can use reduced gauge wiring and simplified routing inside the panel or field enclosure.
• Streamline UL508A Panel Certification - UL-listed Class 2 electronic circuit protectors simplify documentation, testing, and inspection processes.

Electronic circuit protectors for Class 2 circuits

E-T-A’s REX electronic circuit protectors and the ESS31 circuit breaker comply with UL 2367 and UL 508 (LISTED) requirements, as well as UL1310, Class 2 Power Units. By using these DC 24 V overcurrent protection devices, the user reduces costs and space requirements and special NEC Class 2 switch mode power supplies are omitted.

Want to learn more about the benefits of E-T-A's electronic circuit protectors? Click here to learn more and see the product lineup!