The Benefits of Electronic Circuit Protectors in NEC Class 2 Circuits
Many machines and systems that are manufactured in Europe are exported to North America. For this market, 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:
Class 2 circuits are considered safe in terms of electrical shock and fire hazards. The cost-saving wiring, low power supply costs, and significant savings in UL approval tests are the primary advantages of a NEC Class 2 circuit.
Electronic circuit protectors for Class 2 circuits
E-T-A’s REX12 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.
REX12D-T
The compact and flexible all-in-one solution REX consists of several perfectly matched components. It comprises the EM12-T supply module for the plus and minus potential via a single or double channel REX12-T electronic circuit protector which can be mounted side by side in any number and the PM12-T potential extension module for plus and minus multiplication. Connection of the only 12.5 mm wide modules is exclusively with push-in terminals which allow no-tool time-saving wiring.
REX22D-T
The compact and flexible all-in-one solution REX consists of several perfectly matched components. It comprises the EM12D-T / EM12-T supply module for the plus and minus potential via a single or double channel REX12D-T electronic circuit protector which can be mounted side by side in any number and the PM12-T potential extension module for plus and minus multiplication.
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