Flame Retardant Specifications For Push-in Terminal Block Insulation Materials

Insulating materials for push in terminal block are typically required to meet the UL94 V-0 flame retardant standard. This rating, established by the US certification agency UL, evaluates the burning behavior of plastics in a vertical flame test. V-0 rated materials extinguish rapidly after the flame is removed, have a short burning time, and produce no burning drips.

The selection of insulation materials for push in din rail terminal blocks is not only limited by electrical insulation performance, but also must meet the specifications for thermal and flame testing. Using polyamide (PA66) or modified polymers as insulators for push fit din rail terminals can meet the stringent requirements of vertical burning tests.

With the advancement of environmental regulations, halogen-free flame retardant materials are becoming increasingly common in the manufacture of category push fit terminal block. These materials do not release large amounts of toxic halogen gases when exposed to flame, meet the UL94 V-0 flame retardant rating, and are environmentally friendly.