Current Sensing Relay
CR4395 Series
The
CR4395
Series, Current Sensing Relay provides an effec-
tive and highly stable method for monitoring electrical current.
The current-carrying wire is routed through the opening extend-
ing from the top of the case. When current reaches the level set
by the trip point adjustment, the relay trips and starts the ad-
justable timer. After the timer cycles the electromechanical relay
is energized. A precision voltage reference circuit ensures a
highly repeatable trip point.
Applications
Monitor Electrical Heater Elements
Sense Motor Over/Under Loads
Detect Lamp burn-out
Indicate Phase Loss
OUTPUT OPTIONS
The Relay is available with three different output
configurations, electromechanical relay, op-
toisolated NPN transistor or optoisolated triac.
Specify desired selection in part number.
Features
Variable Trip Point and Time Delay
Monitors Currents from 1 AC to 100 AC Amps
Electrical Isolation Between Circuits
Output Relay Rated up to 20 Amps
LED Trip Status Indicator
Dead Band Prevents Relay Chatter
Calibrated Dial Option Available
External Current Transformers Available
RELAY (-ELR)
D
Relays, Switches, & Sensors
Arrangement: 1 Form C (SPDT)
Contact Material: Silver-cadmium oxide
Terminals: 3
1/4”
Male QC
Mechanical Life: 10 million operations,
typ.@ rated load
Electrical Life: 100,000 operations,
typ. @ rated load
Initial Contact Resistance:
50 milliohms max. @ 500 mA, 12 VDC
Contact Rating: UL508/873 & CSA
Specifications
Mounting:
3/16” dia. clearance holes on 1
15/16
” by 2
15/16
”centers
Environmental:
Operating Temperature: -30° C to +60° C
Storage Temperature: -55° C to +85° C
Power-On Delay: 100 MS MAX
Hysteresis: 5% Max.
Input Supply Power:
Typical 80mA
Max 100mA
Sensed Current:
Max. Continuous: 200% Full Scale
Frequency: 60-400 Hz *
*All specifications for operation at 60 Hz only
Altitude: 2000 meters max.
(Contact factory for High Altitude applications)
Weight 0.5 LBS.
DC SWITCHING (-NPN)
Vce (full off): 30 VDC max.
Isink (full on): 120 mADC max.@ rated full-on
Vce (full on): 1.5 VDC @ 120 mADC Isink
Off state leakage current: 5ua @ 30 VDC
(typical)
AC SWITCHING (-TRC)
Off state voltage: 240 VAC RMS max.
Minimum switch voltage: 24 VAC RMS
On state current: 0.5 AAC RMS max. continuous
Switching mode: Zero crossing
Off state leakage: 60 ua @ 240 VAC max.
Terminals: 2 @ 1/4” Male QC
Regulatory Agencies
E234389
The Professional
Energy Monitoring
Company
VOLTAGE
240 VAC
240 VAC
125 VAC
28 VDC
LOAD TYPE
Resistive
Motor
Motor
Resistive
N.O. CONTACT
20A
2HP
1HP
20A
N.C. CONTACT
10A
1/2 HP
1/4 HP
10A
ISO 9001:2008 Quality Management System
M N TI
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
Web: http://www.crmagnetics.com
62
E-mail: sales@crmagnetics.com
Current Sensing Relay
OUTLINE DRAWING
CRGFS
-100
-200
CR4395 Series
A
B
C
D
2.88 1.60
12
0.79
73.16 40.58 304.8 20.07
3.25 1.75
12
0.82
82.55 44.45 304.8 20.83
D
A
B
C
Top view of Current Sensing Relay
Shown with Remote Current
Transformer Option (-R)
Remote Current Transformers CRGFS - Series
PART NUMBER
CR4395
-
-
SUPPLY VOLTAGE
AC
120
- 120 VAC
240
- 240 VAC
DC
24D
- 24 VDC
All supply voltage tolerances
are ± 10 %
-
TRIP RANGE
110
- 1.0 to 10 AAC
330
- 3.0 to 30 AAC
660
- 6.0 to 60 AAC
101
- 10 to 100 AAC
The trip ranges shown are for
one wire pass through the
window opening. The trip range
may be proportionally lowered
with additional wire passes
through the window.
-
-
-
-
I
- INTERNAL TRANSFORMER
R1
- REMOTE TRANSFORMER
w/ CRGFS-100
(1.60” window diameter)
R2
- REMOTE TRANSFORMER
w/ CRGFS-200
(1.75” window diameter)
TRIP STATUS
EH
- Energized on High, trips
when sense current is above trip
point and returns to non-trip
status when sense current is
below the trip point.
EL
- Energized on Low, trips
when sense current is below trip
point and returns to non-trip
status when sense current is
above the trip point.
LH
- Latch on High, trips when
sense current is above trip point
and remains tripped until
supply power is removed.
LL
- Latch on Low, trips when
sense current is below trip point
and remains tripped until supply
power is removed.
TRIP POINT DIAL
CD
- Calibrated Dial
FP
- Fixed Trip Point
(Specify value of fixed
trip point with order)
D CURRENT TRIP
D
Relays, Switches, & Sensors
No adjustment
dial provided with
the fixed set
point option
25
15
20
10
5
- CD
-3.30 trip range shown
3
30
- FP
OUTPUT OPTIONS
TRIP ON DELAY
A
- .5 to 6 Sec.
B
- 2 to 25 Sec.
C
- .1 to 1 Sec.
X
- none
Time-on delay is the time from when the relay trips to
when the output energizes. The ranges are
guaranteed minimum, actual range may be slightly
greater.
NC NO COM
+
+
-
Electromechanical
Relay
ELR
Optoisolated
NPN Transistor
NPN
Optoisolated
Triac, Zero Crossing
TRC
Example Part Numbers:
CR4395-EH-120-110-CD-ELR-I (Relay with CT on board)
CR4395-EL-240-330-CD-NPN-R1 (Relay with external CRGFS-100)
The Professional
Energy Monitoring
Company
ISO 9001:2008 Quality Management System
M N TI
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
Web: http://www.crmagnetics.com
63
E-mail: sales@crmagnetics.com
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