Compact current relay and
protection assemblies
RXHL 401 and
RAHL 401
1MRK 509 062-BEN
Page 5
Design
description
Compact current
relay RXHL 401
The compact current relay RXHL 401 consti-
tutes the measuring relay of RAHL 401.
The compact current relay RXHL 401 is a
protective class II equipment in which protec-
tion against electric shock does not rely on
basic insulation only, but in which additional
safety precaution such as double insulation or
reinforced insulation are provided.
RXHL 401 is a three-phase static, micropro-
cessor-based relay with four input current
transformers for galvanic insulation. The
input signals are connected to D/A-converters
and then filtered. The signals are sampled in
the A/D-converter and read into the micro-
processor. The unfiltered input signals are
also connected to zero crossing detectors and
read into the microprocessor. All settings of
the relay will be done in the local HMI.
The relay is provided with three LED’s; one
for start, one for trip and one for “in service”.
The relay is provided with two binary inputs
and five binary outputs, the binary inputs are
galvanically separated from the electronics
with opto-couplers. The binary outputs con-
sist of electromechanical relays, each with
one change over contact. RXHL 401 requires
a DC/DC-converter for the auxiliary voltage
/-24 V; RXTUG 22H is recom-
mended. The relay is delivered with 4-short-
circuiting connectors RTXK for mounting on
the rear of the terminal base. The connectors
will automatically short-circuit the input cur-
rents when the relay is removed from the ter-
minal base.
Terminal diagram
Figure 1: RXHL 401
111
112
113
BinaryInput1
121
122
123
BinaryInput2
BinaryOutput1
BinaryOutput2
BinaryOutput3
BinaryOutput4
BinaryOutput5
127
126
128
324
323
325
327
326
328
414
413
415
417
416
418
IL1
131
141
231
241
IL2
331
341
IL3
431
441
I
N
Auxiliary supply ±24V
11
5
11
6
11
4
0
-
+
117
0 V
48 - 60 V
110 - 220 V
RL
0 V
48 - 60 V
110 - 220 V
RL
Current inputs
99000444.vsd
