Sidactor Protection Thyristor Products Page 57 SIDACtor Protection Thyristor Products

SIDACtor Protection Thyristors 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/17 UL 497B provides requirements for protectors used in communication and fire alarm circuits. This standard does not cover devices for primary protection or protection devices used on telephone lines. SIDACtor devices are components recognized in accordance with UL 497B under UL file number E133083. The "Construction" section covers the following requirements: General Corrosion Protection Field-wiring Connections Components Spacing Fuses The "Performance" section covers the following requirements: General Strike Voltage Breakdown Endurance Conditioning Temperature Test Dielectric Voltage-withstand Test Vibration Conditioning Jarring Test Discharge Test Repeated Discharge Test Polymeric Materials Test High Temperature Test Marking Construction and Performance Requirements 1. Strike Voltage Breakdown Test -Protectors are required to break down within the manufacturer's specified breakdown range or within 10% of a nominal single breakdown voltage rating. (Figure 3.17) 2. Endurance Conditioning -Protectors are subjected to 50 impulse cycles. Each cycle is a 1000 V peak, 10 A, 10x1000 s pulse. Pulses are applied in one polarity at 10-second intervals and then repeated in the opposite polarity. 3. Variable Ambient Conditioning -Protectors must comply with the strike voltage requirements after being subjected to an ambient temperature of 0 C for four hours and again after being subjected to an ambient temperature of 49 C for an additional four hours. 4. Discharge Test -Protectors must comply with strike voltage requirements after being subjected to five successive discharges from a 2 F capacitor charged to 1000 V dc. (Figure 3.18) 5. Repeated Discharge Test -Protectors must not break down at a voltage higher than the manufacturer's maximum rated breakdown voltage nor lower than rated stand-off voltage after being subjected to 500 discharges from a 0.001 F capacitor charged to 10,000 V dc. The discharges are applied in five-second intervals between one side of the protector and Ground. Upon completion of the discharge tests, protectors are once again required to meet the strike voltage requirement. (Figure 3.18) Note : The epoxy used to construct a SIDACtor device body meets UL 94V-0 requirements for flammability. Performance Requirements Specific to SIDACtor Devices Test Specimen C 1 R 2 10 5 W R 1 50,000 25 W Variable DC Supply 0-1000 V V Figure 3.17 UL 497B Strike Voltage Breakdown Test Test Specimen Spot Switch C 1 R 2 10 5 W R 1 5 M 50 W Variable DC Supply * 0-12,000 V *Or Voltage Capability Necessary to Develop 10,000 V Across Capacitor V Figure 3.18 UL 497B Discharge Test Regulatory Requirements (continued)

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