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UL certification

PCB terminal blocks and PCB connectors with UL certification

As a responsible manufacturer of device connection technology, Phoenix Contact develops and tests products so that you can have your devices approved for use internationally. The Underwriter Laboratories (UL) recognize terminal blocks and connectors as individual components (UL 1059). In the end application, components undergo final evaluation and are approved together with the device.

Always the right solution for international use

UL certification is essential for the international market. Therefore, over 95% of COMBICON products offer UL certification for every application. The UL report contains the following important information about the product:

Connection data (ratings)
Air clearances and creepage distances
Materials
Dimensions
Application conditions

To the product list

UL approval in accordance with product standard UL 1059 “Terminal Blocks”

In order for Phoenix Contact products to be able to be used in industrial applications without restrictions, they are generally tested and recognized in accordance with UL 1059. The following table lists the air clearances and creepage distances required for the components. The Use Group refers to the subsequent area of application of the end device.

Use Group	Area of application	Maximum voltage (V)	Required clearance (mm)	Required creepage distance (mm)
A	Operating elements, consoles, etc.	150 300 600	12.7 19.1 25.4	19.1 31.8 50.8
B	Standard devices, including office and electronic data processing equipment, etc.	150 300 600	1.6 2.4 9.5	1.6 2.4 12.7
C	Industrial applications, without restrictions	150 300 600	3.2 6.4 9.5	6.4 9.5 12.7
D	Industrial applications, operating equipment with limited rating	300 600	1.6 4.8	3.2 9.5
E	Connection technology for the power range 600 - 1500 V	1001-1500 1001-1500	14 17.8	21.6 30.5
F	Industrial applications, equipment that has been assessed in accordance with UL 508, 508 C, 840	51-1500	As defined in the device standard	As defined in the device standard

UL approvals in accordance with device standards

UL 508 “Industrial control equipment”

Terminal blocks, which are recognized in accordance with UL 1059 Use Group C, meet the requirements of UL 508 for field wiring terminal blocks and can thus be used without restriction in devices in accordance with this standard. In certain cases, UL 508 also permits the alternative rating in accordance with UL 840.

UL 508 C "Power conversion equipment"

This UL standard applies specifically to power electronics (including frequency converters). The requirements for field wiring terminal blocks are similar to the specifications of UL 508. An alternative rating in accordance with UL 840 is also possible here in certain cases.

UL 61800-5-1 “Adjustable Speed Electrical Power Drive Systems – Part 5-1: Safety Requirements [...]”

UL 61800-5-1 is a new standard for power electronics. Here as well, the requirements for field wiring terminal blocks are similar to the specifications of UL 508. An alternative rating in accordance with IEC 60664-1 is possible here in certain cases.

UL 840 "Insulation coordination including clearances and creepage distances for electrical equipment"

This standard describes alternative procedures for designing the insulation of end products for defined ambient conditions (overvoltage category, pollution degree, material index), provided that this is permitted by the device standard.

Special aspects of the product and device standard

Depending on the device standard, PCB terminal blocks and PCB connectors certified in accordance with the product standard
UL 1059 for a maximum voltage of 300 V may also be used in 600 V applications providing certain requirements are met.

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Further information