Siemens 430/440 Inverter/Converter 90/110kw SCR Module SKKT162/16E SKKT162-16E SKKT16216E

SKKT162/16E | Semikron SEMIPACK 2 Dual Thyristor Module — 156A / 1600V / 94×34×30mm / Slovakia / In Production

SEMIPACK 2 — Mid-Range Housing in the Semikron Series

The SKKT162/16E is housed in the SEMIPACK 2 (case A21) — a compact thyristor module format that fits between the smaller SEMIPACK 1 and the larger SEMIPACK 3, 4, and 5 housings. At 94 × 34 × 30 mm, the SEMIPACK 2 provides a practical balance of current capacity, heat dissipation surface area, and panel space requirements.

The SEMIPACK 2 housing places its main power terminals (marked 1, 2, 3 for the common anode-cathode connection, individual cathode, and individual anode) on the top of the case — directly accessible from above for bus bar or cable connection. The control terminals (K1, G1, K2, G2 — two gate-cathode pairs for the two SCR devices) are at the module end.

Key Specifications

Applications — Where 156A / 1600V SCR Modules Work

DC motor control: Phase-controlled rectifiers for DC motor drives in machine tools, textile machinery, printing equipment, and industrial automation. The 156A current class serves motors in the 37–55kW range from standard industrial supplies.

Temperature control: Thyristor-based power controllers for resistance heaters in industrial ovens, chemical reactors, plastics processing, and food processing — where precise temperature regulation requires variable power delivery to the heating elements.

AC motor soft starters: The surge current capability of SKKT162/16E (ITSM ≈ 3,300A, significantly above the 156A continuous rating) allows the thyristor to withstand the heavy inrush current during AC motor start-up — enabling soft-start voltage ramp circuits without thyristor damage.

Professional lighting control: Variable-voltage thyristor dimmers for studio and theatrical lighting — where smooth, flicker-free dimming from full brightness to near-zero requires precise phase control across the full conduction angle range.

FAQ

Q1: What is the difference between SKKT162/16E and the larger SKKT430-16E and SKKT460-16E?

The SKKT162/16E at 156A is in the mid-range of Semikron's SEMIPACK thyristor family — smaller than the 430A (SKKT430-16E) and 460A (SKKT460-16E) SEMIPACK 5 units. All share the 1600V blocking voltage. The 162 class serves drives and controls in the 37–55kW range; the 430–460 class serves 160–250kW applications. The SEMIPACK 2 housing (94 × 34 × 30mm) is significantly more compact than the SEMIPACK 5 (150 × 60 × 52mm).

Q2: How many SKKT162/16E modules are required for a single-phase AC controller?

A single-phase AC voltage controller requires two antiparallel thyristors — one conducting on the positive half cycle, the other on the negative. One SKKT162/16E module contains two thyristors, making it a natural single-package solution for a single-phase AC controller. Both thyristors in the module share the same SEMIPACK 2 housing and heat sink — simplifying the assembly compared to using two separate discrete SCRs.

Q3: What thermal resistance specifications determine heat sink selection for SKKT162/16E?

The relevant thermal parameters are: junction-to-case thermal resistance (Rthjc — from the device datasheet), case-to-heatsink resistance (determined by mounting quality and thermal compound), and heatsink-to-ambient resistance. Calculate the required heatsink thermal resistance from: Rth(heatsink) = (Tj(max) − Ta) / P − Rthjc − Rth(case-heatsink). The maximum junction temperature is typically 125°C; ambient temperature and power dissipation come from the specific application load profile.

Q4: Why is the 250A RMS current rating higher than the 156A average rating?

Thyristor current ratings use two different measures. The 156A IT(AV) is the average on-state current — relevant for power delivery and thermal loading calculations in DC applications. The 250A IT(RMS) is the RMS on-state current — relevant for calculating I²R conduction losses in AC controller applications where the current waveform is sinusoidal rather than DC. For a full sine half-wave, IRMS ≈ 1.57 × ITAV — so 156 × 1.57 ≈ 245A, close to the specified 250A. Both ratings must be respected in the appropriate calculation.