Specifications

Table 16: Surge Protector Specifications
SpecificationCategory
80 Joules per conductor (10/1000 us)Maximum Energy Dissipation
12 VDCMaximum Operating Voltage
Common and normal modesProtection
100 kHz ringwave at 200 A: 15.8 volts 100 kHz ringwave at 500
A: 16.8 volts 3 kA combination wave: 20.8 volts
Suppression Voltage Levels (Common mode)
One pair per bus segmentMaximum Number of Protectors Allowed on MS/TP Bus
1,524 m (5,000 ft) (standard MS/TP bus specification)Maximum Length of MS/TP Bus Between Two Buildings
Using Protector
Encapsulated in Ceramgard® composition for insulation and
environmental protection. Two-part design for easy connection
and replacement of protective device to base using edge
connector. Durable UL Recognized plastic enclosure material
Other Mechanical Features
63.5 x 50.8 x 25.4 mm (2.5 x 2.0 x 1.0 in.)Dimensions (H x W x D)
One pair of surge protectors is required whenever the MS/TP bus wire is routed outside between two buildings. APT
recommends that you install the protector close to the MS/TP device that first receives the bus wires from the outside.
Figure 23 shows an FC bus surge protector wiring example.
The protector does not require that you use any special type of wire for the MS/TP bus, such as double-shielded
twisted cable. Use the standard recommended twisted cable types.
Figure 23: FC Bus Surge Protector Wiring Example
45MS/TP Communications Bus Technical Bulletin: Appendix: FC Bus Auxiliary Devices