3TK1

Siemens 3TK1 contactors are high-current switching devices within the SIRIUS control and protection portfolio, built specifically for AC-1 (resistive load) duty at current ratings of 800 A and 1000 A. At these amperage levels, standard contactors are not rated for the job, and the 3TK1 family handles the switching demands of large industrial loads where reliable operation is critical.

PLC Direct supplies Siemens 3TK1 hardware to customers for maintenance and component replacement in existing 3TK1 installations. Our collection covers the 3TK15 and 3TK17 series contactors, along with the full range of associated accessories and spare parts, including coils, contact pieces, arc chutes, and auxiliary switch blocks.

Where Siemens 3TK1 Contactors Are Used

A failed 3TK1 contactor in a high-power distribution panel or large motor circuit can take down an entire production line, process stage, or utility system until a replacement is sourced. At 800 A and 1000 A ratings, these components are not off-the-shelf and are not available through a local supplier, which makes lead time a real operational risk for maintenance teams managing installed 3TK1 equipment.

Facilities that depend on Siemens 3TK1 contactors include:

• Heavy manufacturing plants with high-power motor load switching
• Industrial heating and resistance load control applications
• Power generation and energy distribution facilities
• Large-scale process industries, including chemical, petrochemical, and pulp and paper
• Infrastructure and utility installations with high-amperage panel requirements
• Material processing operations running high-current switching equipment.

When a 3TK1 contactor or a critical spare needs to be replaced, sourcing that component quickly from available stock keeps a facility running on schedule.

Siemens 3TK1 Products

The 3TK1 collection spans two categories: the contactors themselves and the accessories and spare parts that support them across the 3TK14, 3TK15, and 3TK17 series. All product families and model references below are confirmed on the live PLC Direct collection page.

Product Families

• 3TK15 Series: 800 A, 4-Pole AC-1 Contactors: The 3TK15 series handles AC-1 duty at 800 A with a 4-pole configuration: 4 NO main contacts and 2 NO + 2 NC auxiliary contacts. Available in three coil voltage options — 110 V AC 50 Hz/120 V AC 60 Hz (3TK1542-0AF0), 220–230 V AC 50 Hz/240 V AC 60 Hz (3TK1542-0AP0), and 230–240 V AC 50 Hz (3TK1542-0AU0).
• 3TK17 Series: 1000 A, 4-Pole AC-1 Contactors: The 3TK17 series operates at 1000 A AC-1 duty with the same 4-pole contact arrangement as the 3TK15. Coil voltage options cover 110 V AC 50 Hz/120 V AC 60 Hz (3TK1742-0AF0), 220–230 V AC 50 Hz/240 V AC 60 Hz (3TK1742-0AP0), and 230–240 V AC 50 Hz (3TK1742-0AU0).
• Accessories and Spare Parts for 3TK1 Contactors: A complete set of maintenance components covering the 3TK14, 3TK15, and 3TK17 contactor families:
• Auxiliary switch blocks (3TK1910-3A, 3TK1910-3B): 1st and 2nd lateral-mount switch blocks, 1 NO + 1 NC
• Mechanical interlocking devices (3TK1924-0A): For interlocking two identical contactors
• Surge suppressors / RC elements (3TK1934-0C, 3TK1934-0D): Covering 48–110 V AC and 220–600 V AC ranges
• Terminal covers (3TK1944-0A for 3TK14/3TK15: 3TK1946-0A for 3TK17)
• Arc chutes (3TK1955-0A for 3TK15; 3TK1957-0A for 3TK17): 4-pole, 1 arc chute per unit
• Contact pieces with mounting hardware (3TK1965-0A for 3TK15: 3TK1967-0A for 3TK17): 4 movable and 8 fixed contact pieces
• Replacement magnet coils (3TK1974-0AF0, 3TK1974-0AP0, 3TK1974-0AU0): Covering 110 V AC, 220–230 V AC, and 230–240 V AC for 3TK14, 3TK15, and 3TK17

Available at PLC Direct

• 3TK15 series 800 A, 4-pole AC-1 contactors in 110 V, 220–230 V, and 230–240 V AC coil configurations
• 3TK17 series 1000 A, 4-pole AC-1 contactors in 110 V, 220–230 V, and 230–240 V AC coil configurations
• Auxiliary switch blocks for lateral mounting (1st and 2nd position, 1 NO + 1 NC)
• Mechanical interlocking devices for dual-contactor installations
• Surge suppressors (RC elements) for 48–110 V AC and 220–600 V AC ranges
• Terminal covers for 3TK14/3TK15 and 3TK17 series
• Arc chutes for 3TK15 and 3TK17
• Replacement contact piece sets with mounting hardware.
• Replacement magnet coils for 3TK14, 3TK15, and 3TK17 across all standard coil voltages

What to Know Before You Buy Siemens 3TK1 Parts

Ordering the right 3TK1 component comes down to three variables: the contactor series, the coil voltage, and the hardware condition grade. Getting these right before placing an order avoids delays and ensures compatibility with the installed equipment.

• Hardware condition options: We supply 3TK1 contactors and accessories as surplus sealed, refurbished, and used hardware. Surplus sealed units are factory-sealed stock; refurbished units have been tested and restored to operational condition.
• Compatibility considerations: The coil voltage suffix in the part number identifies the rating: -0AF0 for 110 V AC, -0AP0 for 220–230 V AC, and -0AU0 for 230–240 V AC. For spare parts such as coils and arc chutes, confirm which series (3TK14, 3TK15, or 3TK17) the component is intended for, as these are not interchangeable across all series.
• Part identification: Siemens 3TK1 part numbers follow the format 3TK1[series]-[variant][coil code]. The series digit identifies contactor size — 5 for the 3TK15 at 800 A, and 7 for the 3TK17 at 1000 A. Accessories in the 3TK19xx range are series-specific; always cross-reference the product description to confirm compatibility before ordering.
• Warranty: All Siemens 3TK1 hardware purchased from PLC Direct includes a standard 1-year warranty covering defects and functionality, applicable to surplus sealed, refurbished, and used products.