GE 12IAC66K58A

1. Product Classification & Naming

The GE 12IAC66K58A is a three-pole, electrically held AC contactor from GE's legacy "IAC" (Industrial AC Contactor) series, manufactured from the 1970s through the 1990s. This series was widely used in motor control centers (MCCs), lighting panels, and HVAC systems before being superseded by GE's CL (C-Line) and later ABB's A-series contactors (after ABB acquired GE Industrial Solutions in 2018).

Decoding the Part Number:

Position	Code	Meaning
12	-	Frame size / continuous current rating: 12 Amps
IAC	-	Product family: Industrial AC Contactor
66	-	Coil voltage: 120V AC, 60 Hz (standard)
K	-	Enclosure / termination type: Open-style (no enclosure), screw terminals
58	-	Auxiliary contact configuration: 1 normally open + 1 normally closed (1NO+1NC)
A	-	Revision: First major revision (original design)

2. Product Overview

The GE 12IAC66K58A is a compact, electrically held contactor designed for switching resistive and inductive loads up to 12 amps at 600V AC. It features a molded phenolic housing, silver-cadmium oxide (AgCdO) contacts for arc resistance, and a magnetically latched (but not mechanically latched) armature. Unlike larger "definite purpose" contactors, the IAC series was built for general industrial applications where moderate switching frequency (up to 600 operations per hour) and long electrical life (1 million operations at rated load) were required.

The contactor is electrically held – meaning the coil must remain energized to keep the contacts closed. When coil power is removed, the armature returns to the open position via a spring mechanism. This design is standard for across-the-line motor starting (full voltage start) and lighting control.

Typical applications included:

• Small pump motors (1–5 HP at 230V, 3–7.5 HP at 460V)

• Fan and blower control in HVAC units

• Resistance heating elements (industrial ovens, heat trace)

• Lighting contactor banks (fluorescent or HID lighting)

• Solenoid valve pilot circuits

4. Technical Specifications 

Parameter	Value
Rated Operational Current (Ie)	12 A (continuous)
Rated Insulation Voltage (Ui)	600V AC
Rated Impulse Withstand Voltage (Uimp)	6 kV
Maximum Horsepower (AC-3 duty)	3 HP @ 230V single phase; 5 HP @ 230V 3-phase; 7.5 HP @ 460V 3-phase
Rated Operational Voltage (Ue)	600V AC maximum
AC-3 (motor starting) rating	12A @ 600V
AC-1 (resistive) rating	15A @ 600V
Short-circuit protection (fuse max)	30A (Class J or CC)
Short-circuit protection (breaker max)	20A (C-curve or D-curve)
Coil voltage	120V AC ±10% (60 Hz)
Coil inrush power	70 VA
Coil holding power	9 VA
Coil operating limits	Pickup: 85% of rated (102V AC); Dropout: 20% of rated (24V AC)
Auxiliary contacts	1 NO (13-14) + 1 NC (21-22) – snap-action, silver alloy
Auxiliary contact rating	5A @ 240V AC (AC-15), 0.5A @ 125V DC (DC-13)
Electrical life (AC-3)	1 million operations (at rated load)
Mechanical life	10 million operations (no load)
Maximum operating rate	600 operations per hour
Ambient temperature (operation)	–20°C to +65°C (–4°F to +149°F)
Ambient temperature (storage)	–40°C to +80°C (–40°F to +176°F)
Terminal type	Box lug (screw clamp) – accepts stripped wire or ring terminal
Dimensions (H x W x D)	72 x 48 x 65 mm (2.83 x 1.89 x 2.56 in)
Weight	0.35 kg (0.77 lb)

5. Theory of Operation 

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The GE 12IAC66K58A is a three-pole, electrically held AC contactor from GE's legacy "IAC" (Industrial AC Contactor) series, manufactured from the 1970s through the 1990s.

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