Product Features• According to the relevant requirements in GB 50116-2013 “code for design of automatic fire alarm system”, the short-circuit isolator is connected to the loop. The total number of fire equipment protected by each short-circuit isolator, such as fire detector, MCP and module should not exceed 32.• The short-circuit isolator adopts two forms of short-circuit protection: ring type (Class A wiring)or tree branch type (Class B wiring). It is recommended to adopt ring type protection. When short-circuit occurs at a certain point in the loop, the isolators on both sides of the short-circuit point activate, isolating the short circuit part, but not affecting the normal operation of other devices in the loop• After the short circuit condition is cleared, the isolator resets itself automatically.• Plug-in structure, easy construction and maintenance.
Technical Data
| Item | Parameters |
| Working voltage | DC 16-30V |
| Working temperature | -10…+40℃ |
| Storage temperature | -20…+50℃ |
| Relative humidity | ≤95%(40±2℃) |
| Alarm current | ≥200mA（24V） |
| Indicators | Red |
| Dimensions | (L×W×H)85mm×85mm×41mm |
Structure and installation dimensions
The isolator adopts unfolded installation.
Figure 1 appearance and dimensions 
Input Terminals: 2（3）, 4（5）
Output Terminals: 7（8）, 9（10）
Figure 2 terminals
Wiring
JBF4171 short-circuit isolator ring type (Class A) wiring:
JBF4171 short-circuit isolator tree branch type (Class B) wiring:
