4
4.2.2 Installation of accessories
Accessories include residual current transformers and magnetic rings. The remaining current
transformer passes through all the phase lines and neutral lines, and is installed in the cabinet with a
firm fixation. The secondary side wiring is connected to terminals 40 and 41 of the instrument
through a magnetic ring. The installation method of the magnetic ring is shown in the figure below.
It is installed near the end of the instrument wiring and the wiring bypasses the magnetic ring for
two laps.
4.3 Terminals and wiring
4.3.1 Auxiliary power supply and signal input terminal
Auxiliary power supply Signal input
4.3.2 Switching quantity input/output terminal
DI1 DI2 COM1
24 25 33
Relay output terminal
Switching input terminal
(no auxiliary power supply)
(Only ASJ10L-LD1A)
AL1:
Alarm relay
AL2
：
warning relay
4.3.3 Additional functional terminals
21 22
RS485
通讯
A
B
Remote test remote reset RS485 interface
(Only ASJ10L-LD1A)
4.4 Matters needing attention
A) The grounding wire (PE) shall not penetrate the remaining current transformer.
B) For single-phase power grid, only phase lines and neutral lines need to penetrate the residual
current transformer.
C) ASJ10L-LD1A/C provides RS485 communication interface and adopts Modbus-RTU
protocol. No more than 128 instruments can be connected on one line at a time.
