Signals ground faults via digital output. Operates at 24 VDC. Ideal for monitoring ground resistance.
Product Model789-665
Product ID45008
Stock on Request
Last updated: 8/29/2026
Key Features
1
FeatureMonitors ground resistance to ensure electrical safety
2
FeatureOperates at 24 VDC for compatibility with various systems
3
FeatureProvides ground fault alarm via digital output
4
FeatureCompact design with a module width of 18 mm
5
FeatureNon-adjustable, asymmetric isolation resistance for reliable signaling
Technical Specifications
Detailed engineering parameters based on manufacturer documentation
Specifications may be subject to change without notice
Parameter
Value
Parameter
Value
Nominal supply voltage US
DC 24 V (SELV)
Supply voltage range (DC)
DC 18 31.2 V
Current consumption at nominal supply voltage
≤ 40 mA
Power loss Pl
≤ 1.7 W
Current at ground fault (24 VDC) max.
56mA
Operation status indicator
1 x LED 鈥淪tatus OK(green)
6
FeatureMonitors ground resistance to ensure electrical safety
7
FeatureOperates at 24 VDC for compatibility with various systems
8
FeatureProvides ground fault alarm via digital output
9
FeatureCompact design with a module width of 18 mm
10
FeatureNon-adjustable, asymmetric isolation resistance for reliable signaling
Signaling
1 x LED 鈥淚so Alarm(red)
Switching voltage (max.)
48 VDC (SELV)
Continuous current (max.)
500 mA (for general use)
Number of Iso OK contacts connected in series (max.)
25 (Limit value type: 1); 32 (Limit value type: 2 and 3) (per IEC 61131)
Function
1 make contact (NO); closed with applied power supply and insulation resistance > limit value
Backup fusing (required)
The fuse must be placed in the output circuit of the power supply. The fuse must be adapted to the power supply used and must trip safely in case of a short circuit. The module is designed for use with a 10 A (max. ) fuse or with a 10 ADC (max.) circuit breaker (characteristic B or C).
Pollution degree
2
Overvoltage category
II
Protection type
IP20
Test voltage (supply/Iso OK contact)
1.5 kVAC; 50 60 Hz; 1 min
MTBF
> 600,000 h (per MIL-HDBK-217F2)
Response value for alarm at nominal voltage
4 kΩ (at US= 24 V; for other USvalues, see diagram for signaling threshold)
Response time
10s
Hysteresis (typ.)
1kΩ
Connection type 1
X1.x
Connection technology
Push-in CAGE CLAMP®
WAGO connector
picoMAX® eCOM
Solid conductor
0.25 1.5 m㎡/ 24 14 AWG
Fine-stranded conductor
0.25 1.5 m㎡/ 24 14 AWG
Fine-stranded conductor; with insulated ferrule
0.25 0.75 mm2
Fine-stranded conductor; with uninsulated ferrule
0.25 1.5 mm2
Strip length
8 9 mm / 0.31 0.35 inches
Connection type 2
X2.x
Connection technology 2
Push-in CAGE CLAMP®
WAGO connector 2
picoMAX® eCOM
Solid conductor 2
0.2 2.5 m㎡/ 24 12 AWG
Fine-stranded conductor 2
0.2 2.5 m㎡/ 24 14 AWG
Fine-stranded conductor; with insulated ferrule 2
0.25 1.5 mm2
Fine-stranded conductor; with uninsulated ferrule 2
