The RC48C ground-fault ground-continuity monitor has two functions: (1) it measures residual current in electrical circuits to detect ground faults, and (2) it monitors the impedance of grounding conductors to detect issues. If a ground fault or impedance fault is detected, the monitor triggers an alarm relay that can disconnect power. The monitor is intended for use in mining applications to protect high-resistance grounded electrical systems.

1. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Ground-Fault Ground-Continuity Monitor
for AC systems in Mining applications
Function
The RC48C ground-fault ground-continuity monitor:
- Measures the residual current in the respective circuit or
branch of the system by means of a BENDER residual current
transformer. For that purpose, all active conductors (phases +
neutral) are to be passed through the residual current transformer.
If the residual current exceeds the response value the “Alarm
Ground Fault” LED lights and the alarm relay switches.
The alarm contact can be delayed by a selectable time. The
alarm remains stored until the RESET button is pressed.
- Monitors the the impedance of the grounding conductor. For that
purpose, the RC48C superimposes a voltage of 12 V between
the terminals G (G = grounding conductor) and GC (GC =
ground check). Connect the respective conductors of the cable
to these terminals. Connect a termination device E6... between
both conductors at the other end of the cable to be monitored.
By evaluating the voltage drop at this termination device, the
RC48C recognizes series resistance faults (cable high-resistance
or open) or cross resistance faults (short circuit) of the cable.
The alarm relay trips immediately if a series resistance or a cross
resistance fault occurs. As soon as the cause of the alarm no
longer exists, the relay automatically deenergizes again.
Alarm messages are also indicated by the LED “Alarm Ground Fault”
on the RC48C or on a remote alarm indicator and operator panel. The
alarm message “Ground Check Fault” is indicated at the RC48C only.
The alarm relay can be used for the tripping of a contactor or load
switch. Depending on the type of load switch the operating mode
of the alarm relay can be set to N/O (shunt) operation or N/C (UV)
operation.
The termination device E6S-T is distinguished from the other
termination devices in that it has an additional resistor for remote
switch-off. If this resistor is activated by an external NC contact,
an alarm (Ground Check Fault) occurs. The connected load switch
disconnects the system via the alarm relay.
RC48C
RC48C
Ground-Fault Ground-Continuity Monitor
Intended use
The RC48C ground-fault ground-continuity monitor is used to monitor
the residual current in high-resistance grounded installations and to
monitor the continuity of the trailing cable.
The RC48C ground-fault ground-continuity monitor meets the
requirements of CSA M421-00 and combines two functions in one
device.
1. Ground fault protection: The RC48C monitors the residual current
and operates in a fixed time if the current exceeds the preset value.
2. Ground continuity monitoring: The RC48C continuously monitors
the cable and operates if:
A) the ground check conductor opens
B) the ground return conductor opens
C) the ground check conductor shorts to ground
If a value is not within the tresholds, a relay with two voltage free
change over contacts will be operated. These contacts can be jumper
selected for shunt or UV operation.
Safety information
Installation, connection and commssioning of electrical equipment shall
only be installed by qualified electricians!
1
Quality System
Certified
I S O 9 0 0 1 VDE IEC

2. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Operating and display elements
Legend to operating and display elements
1 Pressing the TEST button initiates the following sequence: a test
current is being simulated, after the expiry of the response time
an alarm is recognized which causes the alarm relay to switch
and the red “Alarm Ground Fault” LED to light up. The alarm
message is stored.
2 Pressing the RESET button deletes alarm message.
3 ON LED (green) indicates that the RC48C is in operation.
4 “Alarm Ground Fault” LED (red) lights when the ground fault
current exceeds the alarm response value and the time delay.
LED will flash if a CT is not connected.
5 “Ground Check Safe” LED (green)
-lights when no series resistance fault or cross resistance
fault exists
-flashes in case of series faults in the range > 40 Ω to
approx. 210 Ω
-doesn’t light in case of series resistance faults < 210 Ω.
-doesn’t light in case of cross resistance faults < 70 Ω.
6 “Ground Check Fault” LED (red)
-flashes in case of series faults in the range > 40 Ω to
approx. 210 Ω
-lights in case of series resistance faults < 210 Ω.
-lights in case of cross resistance faults < 70 Ω.
7 DIP switch:
Filter off / on: bandpass filter 60 Hz
When the bandpass filter is switched on, only the narrow-
band 60 Hz components of the residual current are detected.
This function can be used to avoid false trippings caused by
the occurrence of harmonics and transient components in the
residual current.
I∆n x 10 / x 1: for setting the residual current response value
I∆n/A:
x1: 0.1 A ... 1A or x10: 1 A ... 10 A.
8 Setting the time delay t/s for residual current measurement from
0.1 to 2 seconds.
9 Setting the residual current response value to 0.1 A ... 1 A
respectively 1 A ... 10 A.
RC48C discription
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3. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Installation
The device is suited for:
• mounting into standard distribution panels acc. to DIN EN 43 871
• or DIN rail mounting (A) acc. to DIN EN 50022
• or screw mounting (B)
Prior to installation and before work activities are
carried out on the connecting cables of the device,
make sure that mains power is disconnected.
Failure to comply with this safety information
may cause electric shock to personnel.
Furthermore, substantial damage to the electrical
installation and destruction of the device might
occur.
Terminal screw torques are as follows: (C): 0.5
... 0.6 NM (4.3 ... 5.3 lb-in).
Figure 1: RC48C dimensions, in inch
Connection
Connect the RC48C as described in the diagram below
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4. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Legend to Wiring diagram
Components:
NGR Neutral grounding resistor, 25A or less.
K2 External load switch, disconnects the system being monitored in
case of an alarm.
CT Residual current transformer.
Locate the residual current transformer as shown in the wiring
diagram.
Only pass the active conductors (all phases and the N conductor,
if available) through the residual current transformer. The
conductors G (Ground) and GC (Ground Check) must not be
passed through the transformer. Connect the transformer to the
terminals k and l of the RC48C.
Do not ground any of the CT connections.
The residual current transformer is equipped with overcurrent
protection.
E6... Termination device to terminate the conductors G (Ground) and
GC (Ground Check) of the cable. Always locate the termination
device at the end of the cable near to the electrical load.
Connect the terminal G of the termination device to the
enclosure of the electrical load to ensure that the low-resistance
connection between enclosure and ground will be monitored.
E6S-T Termination device.
The same function as E6S, but additionally provided with a
remote disconnecting means via an external break contact
(stop).
Connect the terminals G and GC, as already described above.
In addition, connect the terminals GC and T to the external NC
contact.
If the external NC contact is activated, an alarm ground check
is triggered in the RC48C. The alarm relay disconnects the
connected circuit of the system and the red ground-check LED
flashes.
RI2000GC Remote alarm indicator and operator panel with TEST
button (T), RESET button (R), “Alarm Ground Fault” LED
(GFA) and “Ground Check Safe” LED (GCS). The functions
of the buttons and LEDs and the designations correspond to the
respective operating elements on the RC48C.
M Electrical load supplied by the cable being monitored.
F Short-circuit protection supply voltage: a 6 A fuse is
recommended.
Connections:
A1,A2 Connection supply voltage Us.
11,12,14 and 21,22,24 Two voltage free changeover contacts,
trip in case of alarm. UV operation or N/O operation selectable.
NC, NC Select N/O operation or N/C operation for the free changeover
contacts:
Bridge open: N/O (shunt) operation
Bridge closed: N/C operation (UV) (factory setting)
k,l Connection residual current transformer, alarm LED flashes if
the CT connection is interrupted
GC. G Connection to the conductor G (Ground) and GC (Ground
Check) of the cable.
Connection to the remote alarm indicator and operator panel
RI2000GC:
T Connection external TEST button
R Connection external RESET button
GFA Connection external “Alarm Ground Fault”LED
GCS Connection external “Ground Check Safe” LED
U+, U- Output DC 12 V, e.g. for the supply of the remote alarm indicator
and operator panel RI2000GC.
C1, C2, U+ Bridge supplying the remote alarm indicator and operator
panel RI2000GC with supply voltage from the RC48C.
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5. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Technical data
Insulation coordination acc. to IEC 60664-1:
Rated insulation voltage AC 250 V
Rated impulse withstand voltage/contamination level 2.5 kV/3
Voltage Ranges:
Supply voltage US
AC/DC 60 ... 264 V, 50 / 60 Hz
Fuse recommended: 6 A slow fuse
Power consumption approx. 5 VA at AC 60 V
approx. 8.5 VA at AC 264 V
Residual-Current Monitoring:
Response value, residual current adjustable 0.1 ... 1 A
resp. 1 ... 10 A
Accuracy + 0 ... - 25 %
Response delay adjustable 0.1 ... 2 s
Accuracy of the response delay ± 20 %
Continuous short circuit current 200 A
2500 A for 2 seconds
Operating mode latching
Ground-Conductor Monitoring:
Response value, series resistance fault 40 Ω
Accuracy +/-10 Ω
No-load voltage DC12V
Οutput impedance 240 Ω
Rated current of the measuring loop AC25V continuous
Protection against stray voltage AC120V for 3 seconds
Delay on release 1.5 s
Response time, series resistance faults 0.2 s
Response time, cross resistance faults 0,2 s
Accuracy of the response time ± 20 %
Operating mode non latching
Inputs:
Connection to the residual current transformer:
Single wire, 0.75 mm2
(AWG 18) up to 1 m (3’)
Single wire, twisted 0,.5 mm2
(AWG 18) 1 ... 10 m (3 ... 30’)
Shielded cable 0.75 mm2
(AWG 18) (shield to Ground) 10 ... 25 m
(30 ... 75’)
Outputs:
Switching elements (alarm relay) 2 Form C contacts
Rated contact voltage AC 250 V / DC 300 V
Limited making capacity AC/DC 5 A
Limited breaking capacity AC/DC 2/0.2 A
Permissible number of operating cycles 12000 cycles
Operating mode (alarm relay), selectable N/O (shunt) operation
or N/C (UV) operation
Switching elements (GFA, GCS) 1 NO contact each
Rated contact voltage AC 250 V / DC 300 V
Limited making capacity AC/DC 5 A
Limited breaking capacity AC/DC 2/0.2 A
Permissible number of operating cycles 12000 cycles
Type Tests:
Test of the electromagnetic compatibility (EMC)
Immunity according to IEC 62020
Emission according to EN 50081
Emissions according to EN 55011/CISPR11 class A
General data:
Ambient temperature, during operation - 40 °C ...+ 60 °C
(233 K ... 333 K)
Storage temperature range - 55 °C ... + 80 °C
(218 ... 353 K)
Climatic class acc. to IEC 60721 3K5
Operating mode continuous operation
Mounting any position
Connection screw terminals
Cross sectional area of connecting cable, single wire 0,2 ... 4 mm2
(AWG 24 to 12)
Cross sectional area of connecting cable, flexible 0,2 ... 2,5 mm2
(AWG 24 to 14)
Protection class according to DIN EN 60529
Built-in components IP 30
Terminals/with terminal covers IP 20
Flammability class UL94V-0
Weight approx. 360 g
Applied Standards
CSA M421-00: July 2000: Use of electricity in mines
AS 2081.1 - AS2081.5: Electrical equipment for Coal and Shale Mines
IEC 62020:1998-08 Residual Current Monitors
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6. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Accessories
Dimensions in mm (inches)
Termination device E6
Termination device E6-50
Termination device E6S
Termination unit E6S-T
Remote alarm indicator and operator panel
RI2000GC
(Installation into standard “one-gang (G1) box”.)
The termination devices E6 and E6-50 are
delivered without an enclosure.
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7. Bender Industrial Products - 700 Fox Chase - Coatesville PA 19320 - Tel. (800)-356-4266 - Fax. (610) 383-7100 - www.bender.org
RC48C
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Residual current transformers
Only BENDER residual current transformers are to be used for RC48C units.
Ordering details
Type Designation Part.No
RC48C-935 Ground-Fault Ground-Check Monitor B9401 3002
E6 Termination device for RC48C, P= 5W B9401 3008
(without enclosure)
E6-50 Termination device for RC48C, P= 5W B9401 3009
(without enclosure)
E6S Termination device for RC48C, P= 5W B9401 3006
E6S-T Termination device for RC48C with B9401 3007
an integrated resistor for remote
disconnection, P= 50W
RI2000GC Remote alarm indicator and operator B9407 1000
panel for RC48C
CT-M70 Residual current transformer ID= 2.8" B911 777
CT-M105 Residual current transformer ID= 4.2" B911 778
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