• LS Electric Mini GTH/GTK-12M Thermal Overload Relay (0.1-16 A)
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LS Electric Mini GTH/GTK-12M Thermal Overload Relay (0.1-16 A)

LS Electric Mini GTH/GTK-12M Thermal Overload Relay (0.1-16 A)

Compact bimetallic thermal overload relays for LS Electric Mini contactors GMC/GMD-6M to 16M, available in standard, 3-element and phase-loss (differential) versions from 0.1 to 16 A.

Key features

  • Plugs directly onto Mini contactors GMC/GMD-6M, 9M, 12M, 16M (screw terminal)
  • Separate mounting on DIN rail or screws with standalone unit AZ-12MH (sold separately)
  • Built-in ambient temperature compensation (-5 to 40 C)
  • Manual/automatic reset selection (factory set to manual), trip indicator and test button
  • GTK-12M: differential mechanism for phase-loss protection
  • Built-in 1NO+1NC auxiliary contact, 3-step current setting dial

Specifications

Frame 12 A (0.1-16 A)
Trip class 10A (inverse time)
Rated insulation voltage 690 V
Auxiliary contacts 1NO+1NC
Aux. rating AC-15 2 A at 220 V
Power consumption 1.8 VA per element
Dimensions (W x H x D) 45 x 73.2 x 63.7 mm
Weight 0.1 kg
Standards IEC 60947-4-1, UL, CE, CCC
Source LS Electric Mini MS catalog C04061-03 (2026-09), p. 10-11, 14, 28-29, 53
GTH-12M-0.16 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.1-0.16 A | Mid setting: 0.14 A
GTH-12M-0.25 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.16-0.25 A | Mid setting: 0.21 A
GTH-12M-0.4 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.25-0.4 A | Mid setting: 0.33 A
GTH-12M-0.63 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.4-0.63 A | Mid setting: 0.52 A
GTH-12M-1 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.63-1 A | Mid setting: 0.82 A
GTH-12M-1.6 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 1-1.6 A | Mid setting: 1.3 A
GTH-12M-2.5 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 1.6-2.5 A | Mid setting: 2.1 A
GTH-12M-4 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 2.5-4 A | Mid setting: 3.3 A
GTH-12M-6 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 4-6 A | Mid setting: 5 A
GTH-12M-8 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 5-8 A | Mid setting: 6.5 A
GTH-12M-9 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 6-9 A | Mid setting: 7.5 A
GTH-12M-10 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 7-10 A | Mid setting: 8.5 A
GTH-12M-13 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 9-13 A | Mid setting: 11 A
GTH-12M-16 Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 12-16 A | Mid setting: 14 A
GTH-12M/3-0.16 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.1-0.16 A | Mid setting: 0.14 A
GTH-12M/3-0.25 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.16-0.25 A | Mid setting: 0.21 A
GTH-12M/3-0.4 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.25-0.4 A | Mid setting: 0.33 A
GTH-12M/3-0.63 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.4-0.63 A | Mid setting: 0.52 A
GTH-12M/3-1 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.63-1 A | Mid setting: 0.82 A
GTH-12M/3-1.6 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 1-1.6 A | Mid setting: 1.3 A
GTH-12M/3-2.5 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 1.6-2.5 A | Mid setting: 2.1 A
GTH-12M/3-4 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 2.5-4 A | Mid setting: 3.3 A
GTH-12M/3-6 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 4-6 A | Mid setting: 5 A
GTH-12M/3-8 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 5-8 A | Mid setting: 6.5 A
GTH-12M/3-9 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 6-9 A | Mid setting: 7.5 A
GTH-12M/3-10 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 7-10 A | Mid setting: 8.5 A
GTH-12M/3-13 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 9-13 A | Mid setting: 11 A
GTH-12M/3-16 Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 12-16 A | Mid setting: 14 A
GTK-12M-0.16 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.1-0.16 A | Mid setting: 0.14 A
GTK-12M-0.25 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.16-0.25 A | Mid setting: 0.21 A
GTK-12M-0.4 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.25-0.4 A | Mid setting: 0.33 A
GTK-12M-0.63 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.4-0.63 A | Mid setting: 0.52 A
GTK-12M-1 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.63-1 A | Mid setting: 0.82 A
GTK-12M-1.6 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 1-1.6 A | Mid setting: 1.3 A
GTK-12M-2.5 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 1.6-2.5 A | Mid setting: 2.1 A
GTK-12M-4 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 2.5-4 A | Mid setting: 3.3 A
GTK-12M-6 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 4-6 A | Mid setting: 5 A
GTK-12M-8 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 5-8 A | Mid setting: 6.5 A
GTK-12M-9 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 6-9 A | Mid setting: 7.5 A
GTK-12M-10 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 7-10 A | Mid setting: 8.5 A
GTK-12M-13 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 9-13 A | Mid setting: 11 A
GTK-12M-16 Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 12-16 A | Mid setting: 14 A
Overload RelaysLS Electric
42 product codes available in this family
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LS Electric Mini GTH/GTK-12M Thermal Overload Relay (0.1-16 A)

Brand LS Electric·Overload Relays

Available part numbers (42)

GTH-12M-0.16, GTH-12M-0.25, GTH-12M-0.4, GTH-12M-0.63, GTH-12M-1, GTH-12M-1.6, GTH-12M-2.5, GTH-12M-4, GTH-12M-6, GTH-12M-8 + 32 more — see full table ↓

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Product codes & specifications
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Product codeSpec
GTH-12M-0.16Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.1-0.16 A | Mid setting: 0.14 A
GTH-12M-0.25Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.16-0.25 A | Mid setting: 0.21 A
GTH-12M-0.4Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.25-0.4 A | Mid setting: 0.33 A
GTH-12M-0.63Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.4-0.63 A | Mid setting: 0.52 A
GTH-12M-1Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 0.63-1 A | Mid setting: 0.82 A
GTH-12M-1.6Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 1-1.6 A | Mid setting: 1.3 A
GTH-12M-2.5Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 1.6-2.5 A | Mid setting: 2.1 A
GTH-12M-4Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 2.5-4 A | Mid setting: 3.3 A
GTH-12M-6Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 4-6 A | Mid setting: 5 A
GTH-12M-8Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 5-8 A | Mid setting: 6.5 A
GTH-12M-9Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 6-9 A | Mid setting: 7.5 A
GTH-12M-10Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 7-10 A | Mid setting: 8.5 A
GTH-12M-13Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 9-13 A | Mid setting: 11 A
GTH-12M-16Model: GTH-12M | Type: Standard (3-pole, 2-element) | Setting range: 12-16 A | Mid setting: 14 A
GTH-12M/3-0.16Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.1-0.16 A | Mid setting: 0.14 A
GTH-12M/3-0.25Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.16-0.25 A | Mid setting: 0.21 A
GTH-12M/3-0.4Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.25-0.4 A | Mid setting: 0.33 A
GTH-12M/3-0.63Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.4-0.63 A | Mid setting: 0.52 A
GTH-12M/3-1Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 0.63-1 A | Mid setting: 0.82 A
GTH-12M/3-1.6Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 1-1.6 A | Mid setting: 1.3 A
GTH-12M/3-2.5Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 1.6-2.5 A | Mid setting: 2.1 A
GTH-12M/3-4Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 2.5-4 A | Mid setting: 3.3 A
GTH-12M/3-6Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 4-6 A | Mid setting: 5 A
GTH-12M/3-8Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 5-8 A | Mid setting: 6.5 A
GTH-12M/3-9Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 6-9 A | Mid setting: 7.5 A
GTH-12M/3-10Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 7-10 A | Mid setting: 8.5 A
GTH-12M/3-13Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 9-13 A | Mid setting: 11 A
GTH-12M/3-16Model: GTH-12M/3 | Type: 3-pole, 3-element | Setting range: 12-16 A | Mid setting: 14 A
GTK-12M-0.16Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.1-0.16 A | Mid setting: 0.14 A
GTK-12M-0.25Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.16-0.25 A | Mid setting: 0.21 A
GTK-12M-0.4Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.25-0.4 A | Mid setting: 0.33 A
GTK-12M-0.63Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.4-0.63 A | Mid setting: 0.52 A
GTK-12M-1Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 0.63-1 A | Mid setting: 0.82 A
GTK-12M-1.6Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 1-1.6 A | Mid setting: 1.3 A
GTK-12M-2.5Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 1.6-2.5 A | Mid setting: 2.1 A
GTK-12M-4Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 2.5-4 A | Mid setting: 3.3 A
GTK-12M-6Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 4-6 A | Mid setting: 5 A
GTK-12M-8Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 5-8 A | Mid setting: 6.5 A
GTK-12M-9Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 6-9 A | Mid setting: 7.5 A
GTK-12M-10Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 7-10 A | Mid setting: 8.5 A
GTK-12M-13Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 9-13 A | Mid setting: 11 A
GTK-12M-16Model: GTK-12M | Type: Phase-loss (differential) | Setting range: 12-16 A | Mid setting: 14 A

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