ZAC29C-3P3-120A+KR XIMADEN SSR Three Phase CYC-Zero Switch

Description

The ZAC29C-3P3-120A+KR, a specific model within the XIMADEN ZAC29C series, is the industry’s most widely adopted, high-performance 220VAC Three Phase SCR Power Regulator. It is functionally defined as an SSR Three Phase CYC-Zero Switch, featuring compact dimensions of 306 x 125 x 210 mm. Rated for a 120 A pure resistive load, this model includes essential integrated fast-acting fuse protection (KR). It utilizes CYC-Zero switching and supports both manual DC 0 to 5 V input and automatic signals, including isolated 4 to 20 mA for precise power modulation. The unit employs the advanced ZAC10 cycle control system to achieve highly stable load current balancing. Structurally, it is designed in a safe, dust-proof casing and utilizes three replaceable DBC-welded solid state relays. Comprehensive protection includes a fan stall alarm and over-temperature shutdown at over 80 deg C. This robust regulator is broadly applied in fields such as industrial electric heating, aviation, motor control, CNC machinery, lighting control, and security fire systems.

ZAC29C-3P3-120A+KR Regulator Parameters
Model: ZAC29C-3P3-120A+KR
Pure Resistive Load Current: 120 A
Protection Feature: Integrated Fast-Acting Fuse (KR)
Dimensions: 306 x 125 x 210 mm
Cooling Method: Fan Cooling
Output & Control Method: PWM or CYC Output; Control: Power Modulation
Regulation Output Resolution: 0.2 ms
Manual Input Signal: DC 0 to 5 V
Auto Control Signal (I-type): 4 to 20 mA (Input Impedance < 250 Ohm)
Auto Control Signal (P-type): PWM (Period 2 s, Max Input Current < 5 mA)
Alarm Output: Relay Alarm Contact (240 VAC 2 A Pure Resistive)
Internal Power Supply: 380 V
Fan Power Supply: 220 VAC 50 HZ
Power Consumption: 3 W
Operating Temperature: -10 to 55 deg C
Over-Temperature Protection: Radiator Temp over 80 deg C Prohibits Output and Alarm
Fan Protection: Fan Stall Alarm (1 min Delay)
Installation Environment: Wall-Mounted Vertical, Good Ventilation
Relative Humidity: 90% (Derating Required)
Application Scenarios: Industrial Electric Heating, Aviation, Motor Control, CNC Machinery, Lighting Control, Security Fire Systems.

There are two models: ZAC29C-3P3-120A+KR comes with a built-in fuse, while ZAC29C-3P3-120A does not. The KR suffix indicates that this model includes a built-in fuse.

ZAC29C-3P3-120A+KR is part of XIMADEN’s ZAC29C series and is a widely used three-phase zero-cross cycle power controller designed for industrial electric-heating applications. It supports both 4–20 mA and PWM inputs, with PWM or CYC (cycle) output modes. The unit features a European-style safety dust-proof structure and multi-color LED indicators (red, blue, green) for clear working-status display.

Equipped with the new CS cooling system and ZAC10 cycle-control technology. Insert-type heat sink offers 30% higher cooling efficiency.

Uses three replaceable long-life DBC-soldered solid-state relays, avoiding the risk of centralized failure in integrated SSR modules.

Built-in RC snubber to suppress inverter interference, heat-sink over-temperature alarm output, intelligent status lights, and Hall-sensor interface for the CS cooling system.

Suitable for purely resistive industrial loads in 50 Hz single-phase or three-phase (delta or star) configurations.

Advanced Zero-Cross Cycle Output
The controller switches load current at evenly distributed points on the sine wave. When multiple controllers run simultaneously, their load currents overlap randomly, resulting in balanced total power load. This improves regulation accuracy and power utilization, reduces meter needle fluctuation, avoids unnecessary power-capacity upgrades, and delivers significant energy-saving benefits.

Main Technical Specifications

• Input (Optically Isolated, Type P): PWM duty-cycle pulse input; period 2 s; High: 4–15 V; Low: <1.5 V; Max input current <20 mA.
• 4–20 mA Input (Type I): Input impedance <250 Ω; compatible with Shinko P/I-type PID controllers or DCS analog output interfaces.
• Start/Stop Control: External dry-contact (no-voltage) switch.
• Internal Structure: Three series-connected SSRs (or two SSRs in some models).
• Internal Power Limit: Adjustable via internal potentiometer P1; range 0–100% (factory default: unlimited).
• Soft-Start: 60-second soft-start on first power-up to reduce cold-start inrush.
• Status Indicators: Green LED for PWM or 4–20 mA signal; blue LED for operating status; red LED for alarm.
• Load Connection: 50 Hz single-phase or three-phase (delta/star), fully controlled purely resistive loads; no phase-sequence requirement.
• Heat-Sink Over-Temperature Alarm: Trigger at 80°C; normally open relay contact, 1 A resistive load.
• Cooling Fan Operation: 1) Always-on mode; 2) Auto mode — fan activates above 40°C; temperature accuracy ±5°C.
• Power Supply: 220 VAC, 50 Hz (380 V not supported); power consumption 3 W; requires external 0.3 A fuse.