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C-curve two-pole supplementary protectors trip instantaneously when the current load exceeds five to ten times the rating of the device. These breakers mount on standard 35mm DIN rail and are UL1077 listed for use as supplementary protection from damage caused by overcurrents and short circuits. They protect two circuits at the same time and are used when protection against medium-level short circuit faults is desired, such as in control panels, lighting, and coils. This listing is for each. UL 1077, CSA 22.2 APPROVAL; 230/400 VAC AT 50/60 HZ, 60 VDC VOLTAGE RATING; 6 KILOAMPERE INTERRUPTING RATING; 4 AMPERE CURRENT RATING; 2 POLE(S); 5SY6 MODEL