P4802ACMC datasheet(154/212 Pages) TECCOR

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UL 497B

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SIDACtor® Data Book and Design Guide

UL 497B

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.

Construction and Performance Requirements

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

Performance Requirements Specific to SIDACtor Devices

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 4.12)

2. Endurance Conditioning — Protectors are subjected to 50 impulse cycles. Each cycle is

a 1000 V peak, 10 A, 10x1000 µs 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 µF capacitor charged to 1000 V dc.

(Figure 4.13)

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

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