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FAQ03198 of General Purpose Relays FAQ

FAQ No. FAQ03198

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Question

What are the recommended replacement products for G2J General-purpose Relays or G4J?

Answer



1.Replacement products for G2J and G4J depend on the model number. Check in the following table.

Discontinued modelRecommended
replacement
Remarks
Contact formG2J pr G4J (See note 1)
AC coilDC coil
1 poleSPST-NOHinged Relay
(See note 2)
G2J-1112T
G4J-1142T
Hinged Relay
(See note 2)
G2J-1112T-US
G4J-1142T-US
G7J-2A2B-T
G7J-3A1B-T
G7J-4A-T
See note 5.
2 polesSPST-NO/
SPST-NC
G2J-2112T
G4J-2142T
G2J-2112T-US
G4J-2142T-US
G7J-2A2B-T
G7J-3A1B-T
DPST-NOG2J-2212T
G4J-2242T
G2J-2212T-US
G4J-2242T-US
G7J-2A2B-T
G7J-3A1B-T
G7J-4A-T
3 polesDPST-NO/
SPST-NC
G2J-3212T
G4J-3242T
G2J-3212T-US
G4J-3242T-US
G7J-2A2B-T
G7J-3A1B-T
3PST-NOG4J-3342TG4J-3342T-USG7J-3A1B-T
G7J-4A-T
Plunger Relay
(See note 3)
G2J-3312T
G2J-3312T-US
G2J-33124T
Hinged Relay
(See note 4)
---
4 polesDPST-NO/
DPST-NC
G2J-4212T
G2J-4212T-US
G2J-42124T
---G7J-2A2B-T
3PST-NO/
SPST-NC
G2J-4312T
G2J-4312T-US
G2J-43124T
G2J-4342T-3
---
---
G7J-3A1B-T
G7J-3A1B-T-KM
See note 6.
4PST-NOG2J-4412T
G2J-4412T-US
G2J-44124T
G2J-4442T-3
G2J-4442T-US-3
---
G7J-4A-T
G7J-3A1B-T-KM

Note:

1.Discontinued models with "US" after the model number indicate that they are UL/CSA-approved models. The recommended replacement models are all UL and CSA approved even without the suffix "US".

2.The design of G2J was modified in 1981 to produce G4J. This is why the discontinued models are G2J or G4J.

3.Discontinued Plunger Relays with five numbers at the end of the model number indicate that they have bottom-mounted cases. Models with four numbers can be mounted either by using W-brackets or an S-brackets only.

4.Discontinued Hinged Relays with the suffix "-3" in the model number indicate that they satisfy the VDE C/250 Class II requirements (8 mm min. insulation between coil and contacts). Recommended replacement models for the G7J are indicated by the suffix "-KM".

5.Some models have more than two replacement models. This is because there are no 1-, 2-, or 3-pole models for G7J. It uses a 4-pole configuration that can switch to other modes.

6.Discontinued models with the suffix "-3" in the model number must be replaced by G7J models with the suffix "-KM", and discontinued models without the suffix "-3" must be replaced with G7J models without the suffix "-KM". (See note 3.)

2.Comparison of the G2J or G4J, and G7J

ItemsG2J or G4JG7JRemarks
Mounting methodW-bracket: M4 screws in 35-mm straight line
S-bracket: M4 screws at diagonally opposed corners of a 58 x 22-mm rectangle
Bottom-mounted case: M4 screws at diagonally opposed corners of a 20 x 60 rectangle, G2J models only
W-bracket: M4 screws in 35-mm straight line
S-bracket: Not applicable
Bottom-mounted case: Not applicable
See note 1.
Dimensions
(including W-brackets)
G4J: 39 x 50 x 73 mm (W x D x H)
G2J:
1, 2, or 3 poles: 39 x 44 x 66 mm (W x D x H)
3 or 4 poles: 39 x 59 x 66 mm (W x D x H)
Bottom-mounted: 38 x 69 x 61 mm (W x D x H)
35 x 52 x 64 mm (W x D x H)See note 2.
Tab terminals#250 terminals#250 terminals
Operating coil
rated voltage (V)
AC: 6, 12, 24, 50
100/(110), 200/(220)
DC: 6, 12, 24, 48, 100
AC: 24, 50
100 to 120, 200to 240
DC: 12, 24, 48, 100
See note 3.
See note 4.

Note:

1.If W-brackets were previously used, it may be possible to mount the replacement Relays without modifications to the structure, but a new W-brackets (R99-04 FOR G5F) must be purchased. This is because W-brackets are not compatible.
If S-brackets were previously used, 4.5-mm-dia. holes or holes for M4 screws must be drilled to mount the replacement Relays using the W-brackets. (G7J cannot be mounted with S-brackets.)
If bottom-mounted cases were previously used, 4.5-mm-dia. holes or holes for M4 screws must be drilled to mount the replacement Relays using the W-brackets. (G7J does not have models with bottom-mounted cases.)

2.If G4J with a 2-mm depth, or a 1-, 2-, or 3-pole G2J with an 8-mm depth was used with a bottom-mounted case, the height will increase by 3 mm.

3.If an operating coil voltage of 6 VAC, 12 VAC, or 6 VDC was used, there are no recommended replacement models. This is because G7J do not support these voltages. However if the voltage can be converted to a voltage supported by G7J, it can be used.

4.G7J Relays with AC coils have built-in full-wave rectifiers, so the rated current will be reduced by half or even a third. For this reason, if Solid-state Relays are used to operate the Relay, a reset failure may occur due to the reduced load.

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