Shanghai Huabang Industrial Business Network - Insulation monitoring relay

[Insulation monitoring relay]ZJJ-2 type DC insulation monitoring relay

2026-6-13 18:50:14

1. Application scope
ZJJ-2 DC insulation monitoring relay is a type of relay that can monitor the insulation condition of DC busbars and is suitable for monitoring the insulation condition of low-voltage DC busbars. When the insulation of the busbar to ground decreases to a certain value, the relay can send a warning signal in advance.

2. Main technical parameters
Voltage level and current value: 220V, 1.5mA; 110V��3.1mA�� 48V��6.3mA��
Relay action value: When the insulation resistance to ground on either side of the busbar drops to the values in the table below, the relay should be activated.

specification	Balanced resistance	Action insulation resistance value	Rated insulation resistance value
220V��1.5mA	2×6.8K��	25-15K	100K
110V��3.1mA	2×2K��	6.4-3.7K	25K
48V��6.3mA	2×400K��	1.5-0.85K	6K

Contact capacity: In a DC inductive load circuit with a voltage not exceeding 250V and a current not exceeding 2A (time constant not exceeding 5 ± 0.75ms), the breaking capacity shall not exceed 50W
Power consumption: The relay output contact can reliably operate and return 10 times under the load conditions specified in the previous article. Not exceeding 7.5W
Power consumption: not exceeding 4.5W.

Internal wiring of ZJJ-2 DC insulation monitoring relay

4. Appearance and opening size
The relay adopts JK-1 housing, with external dimensions and installation hole diagram.

ZJJ-2 type DC insulation monitoring relay

[Insulation monitoring relay]ZZJ-2 DC insulation monitoring relay

2026-6-13 18:49:48

ZZJ-2 DC Insulation Monitoring Relay

[Insulation monitoring relay]JJJ-1 type DC insulation monitoring relay

2026-6-13 18:49:39

JJJ-1 type DC insulation monitoring relay

[Insulation monitoring relay]ZJJ-1A,ZJJ-1/A,JJJ-1 Insulation monitoring relay

2026-6-13 18:33:34

Purpose:
ZJJ-1A, ZJJ-1/A, and JJJ-1 insulation monitoring relays are mainly used to monitor the insulation condition of low-voltage DC busbars. When the insulation of the busbar to ground drops to a certain value, the relay will actuate and issue an alarm signal.

Features:
The ZJJ-1A, ZJJ-1/A, and JJJ-1 insulation monitoring relays have a simple principle, reliable operation, low power consumption, and can replace the insulation monitoring relays of the same model currently in use.

Relay model name:

Working Principle:
The relay model and meaning are as follows: The relay adopts the bridge principle, with a reed relay as the sensitive element and a high impedance intermediate relay as the outlet element. The sensitive element is connected across the ground and the balancing resistor. When the resistance of the DC bus to ground on both sides is equal, no current flows through the sensitive element winding; When the insulation resistance value on one side decreases, an unbalanced current flows through the sensitive element winding. The greater the difference in insulation resistance values between the two sides, the greater the unbalanced current. When the unbalanced current reaches a certain value, the relay will activate and issue an alarm signal.

Main technical parameters of ZJJ-1A, ZJJ-1/A, and JJJ-1 insulation monitoring relays:
5.1 Rated DC voltage: 48V, 110V, 220V.
5.2 Action insulation resistance value: (25~15) kW at 220V; At 110V, it is (6.4-3.7) kW; At 48V, it is (1.5-0.85) kW.
5.3 Relay Contact Types
The relay provides a pair of dynamic contact points.
5.4 Weight: not exceeding 1kg.
5.5 Working conditions
a) The usage location does not allow explosive media, and the surrounding media should not contain corrosive metals, gases that damage insulation, or conductive media. It is not allowed to be filled with water vapor or have serious mold presence;
b) Strong vibrations and impacts are not allowed in the usage location;
c) The usage location should have facilities to defend against rain, snow, wind, and sand;
d) The usage location does not allow an external magnetic induction intensity exceeding 1.5mT.
The conductive circuits of the 5.6 dielectric strength relay should be able to withstand an AC test voltage of 2kV (effective value) and 50Hz between the exposed non charged metal parts, output contacts, and the casing for 1 minute without insulation breakdown or flashover.
5.7 Electrical anti-interference relays shall comply with GB7261 and GB6261 "Electrical anti-interference tests for static relays and protective devices".

Wiring diagram behind the relay:
Rear wiring diagram and typical wiring diagram of relay (see Figure 1-6)

Relay external dimensions and opening dimensions:
a) The external dimensions and opening dimensions of ZJJ-1/A type are shown in Figure 1 of the universal structural system;
b) The external dimensions and opening dimensions of ZJJ-1A type are shown in Figure 3 of the universal structural system;
c) The external dimensions and opening dimensions of JJJ-1 type are shown in Figure 7 of the universal structural system.

Ordering instructions:
8.1 Product model, name, and auxiliary voltage level.
8.2 Order quantity.
8.3 Relay matching: such as base, socket, etc.

[Insulation monitoring relay]ZJJ-1/R type insulation monitoring relay

2026-6-13 18:32:05

Purpose:
ZJJ-1/R type insulation monitoring relay is mainly used to monitor the insulation condition of low-voltage DC bus. When the insulation of the bus to ground drops to a certain value, the relay will act and issue an alarm signal.
The principle is simple, the action is reliable, the power consumption is low, and it can replace the insulation monitoring relay of the same model currently used.

Relay model name:

Working Principle:
The relay adopts the bridge principle, with a reed relay as the sensitive element and a high impedance intermediate relay as the output element. The sensitive element is connected across the ground and the balancing resistor. When the resistance of the DC bus to ground on both sides is equal, no current flows through the sensitive element winding; When the insulation resistance value on one side decreases, an unbalanced current flows through the sensitive element winding. The greater the difference in insulation resistance values between the two sides, the greater the unbalanced current. When the unbalanced current reaches a certain value, the relay will activate and issue an alarm signal.

Main technical parameters of ZJJ-1/R insulation monitoring relay:
5.1 Rated DC voltage: 48V, 110V, 220V;
5.2 Action insulation resistance value: (25~15) k �� at 220V
At 10V, it is (6.4-3.7) k ��
Is it (1.5-0.85) k �� at 48V?
5.3 Relay Contact Types
The relay provides a pair of dynamic contact points.
5.4 Weight: not exceeding 1kg
5.5 Working conditions
a) The usage location does not allow explosive media, and the surrounding media should not contain corrosive metals, gases that damage insulation, or conductive media. It is not allowed to be filled with water vapor or have serious mold presence;
b) Strong vibrations and impacts are not allowed in the usage location;
c) The usage location should have facilities to defend against rain, snow, wind, and sand;
d) The usage location does not allow an external magnetic induction intensity exceeding 1.5mT.
5.6 Dielectric Strength
The conductive circuits of the relay should be able to withstand an AC test voltage of 2kV (effective value) and 50Hz between the exposed non charged metal parts and the casing, as well as between the input circuits and the contacts, for a duration of 1 minute without insulation breakdown or flashover.
5.7 Electrical anti-interference
Relays shall comply with GB7261 and GB6261 "Electrical anti-interference test for emergency protection devices of static relays".

Wiring diagram behind the relay:
Rear wiring diagram and typical wiring diagram of relay (see Figure 1-2)

Relay external dimensions and opening dimensions:
Refer to Figures 1 and 5 in the protruding modular insertion structure.

Ordering instructions:
8.1 Product model, name, and auxiliary voltage level.
8.2 Order quantity.
8.3 Relay matching: such as base, socket, etc. (ABB structural accessories need to be ordered separately).