The RCM420 monitors for ground-fault current in solidly-grounded and high-resistance-grounded AC (single-phase or three-phase) systems. The pickup value is adjustable from 10 mA to 10 A. A separately configurable prewarning alarm is also available. Three separately adjustable time delays are available - a pickup delay, startup delay, and delay on reset.
The RCM420 provides an accurate, RMS value. Measurements are displayed in real-time via the device's on-board digital display. All device settings are configured using the display and push buttons. Two Form-C (SPDT) relay outputs are separately configurable to trigger on the pre-warning or main alarm.
A single current transformer connects to the RCM420 for measuring ground-fault current. A wide range of sizes, shapes, and core types are available.
The RCM420 monitors for ground-fault current in solidly-grounded and high-resistance-grounded AC (single-phase or three-phase) systems. The pickup value is adjustable from 10 mA to 10 A. A separately configurable prewarning alarm is also available. Three separately adjustable time delays are available - a pickup delay, startup delay, and delay on reset.
The RCM420 provides an accurate, RMS value. Measurements are displayed in real-time via the device's on-board digital display. All device settings are configured using the display and push buttons. Two Form-C (SPDT) relay outputs are separately configurable to trigger on the pre-warning or main alarm.
A single current transformer connects to the RCM420 for measuring ground-fault current. A wide range of sizes, shapes, and core types are available.
Part No. | Supply Voltage | Ordering No. |
---|---|---|
RCM420-D-1 | 16-72 VAC (42-460 Hz), 9.6-94 VDC | B94014001 |
RCM420-D-2 | 70-300 VAC (42-460 Hz), 70-300 VDC | B94014002 |
AC current transformers
Part No. | Opening | Shape and Type | Ordering No. |
---|---|---|---|
CTAC20 | 0.78" (20mm) | circular, solid | B98110005 |
CTAC35 | 1.35" (35mm) | circular, solid | B98110007 |
CTAC60 | 2.4" (60mm) | circular, solid | B98110017 |
CTAC120 | 4.7" (120mm) | circular, solid | B98110019 |
CTAC210 | 8.25" (210mm) | circular,solid | B98110020 |
WR70x175S | 2.75"x6.9" (70x175mm) | rectangular, solid | B911738 |
WR115x305S | 4.5"x12" (115x305mm) | rectangular, solid | B911739 |
WR150x350S | 5.9"x13.8" (150x350mm) | rectangular, solid | B911740 |
WR200x500S | 7.9"x19.7" (200x500mm) | rectangular, solid | B911763 |
WS20x30 | 0.75"x1.2" (20x30mm) | rectangular, split-core | B98080601 |
WS50x80 | 2"x3.1" (50x80mm) | rectangular, split-core | B98080603 |
WS80x120 | 3.1"x4.7" (80x120mm) | rectangular, split-core | B98080606 |
Accessories
Type | Art. No. |
---|---|
Mounting clip for screw mounting (one piece per device) | B98060008 |
Mounting frame XM420 | B990994 |
Name | Category | Size | Language | Timestamp | D-/B-Number |
---|---|---|---|---|---|
UKCA - RCM42x | Declarations of Conformity | 122.4 KB | 2023/02/1313.02.2023 | ||
RCM42x | CE Declarations of Conformity | 88.0 KB | 2023/10/1919.10.2023 | ||
RCM420 | Manuals | 11.2 MB | EN | 2023/12/1414.12.2023 | D00057 |
RCM420 | Datasheets | 10.5 MB | EN | 2024/07/3131.07.2024 | D00057 |
RCM420 | Quickstarts | 510.3 KB | EN | 2023/11/1616.11.2023 | D00057 |
XM420 interface options | Datasheets | 223.5 KB | EN | 2019/05/1313.05.2019 | D00051 |
Changed variants of relays from goldplated to silver-plated contacts | Technical Information | 166.3 KB | EN | 2022/06/2727.06.2022 |