MCS-4
White Ceramic
| Variant | INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
| No Grounding |  |
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| Left Grounding |  |
Gold
| INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
Purple Ceramic - Gold Cap
| Variant | INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
| Gold Pins - Squiggly Line |
|
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| Silver Pins - Squiggly Line |  |
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| Silver Pins - NS |
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Purple Ceramic - Silver Cap
| INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
 |
Grey Ceramic
| INS4001J | INS4002-1J | INS4002-2J | INS4003J | INS4004J |
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  |
 |
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Plastic
| Logo | INS4001N | INS4002-1N | INS4002-2N | INS4003N | INS4004N |
| NS Logo |  |
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| Squiggly Line |  |