Product line
Solid State Relays & SCR Power Modules
Manufacturer of solid state relays and SCR power modules: switching SSRs, integrated SCR voltage regulator modules, pulse-triggered SCR power modules and matched SSR heat sinks for industrial heating control. OEM manufacturing, custom model production and factory pricing.
This line covers switching solid state relays, integrated SCR voltage regulator modules, pulse-triggered SCR power modules and matched heat sinks. SCR voltage regulators (thyristor power regulators) control the power delivered to electric heating elements, furnaces, dryers and plastic machinery by phase-angle firing or zero-cross cycle control. Beijing Strong Electric supplies single phase and three phase units from 10A to 500A, at factory-direct pricing with OEM labelling and model selection support before you order.
Switching Solid State Relays
Single-phase and three-phase solid state relays for on/off switching of industrial heating loads.
SSR-DA Single-Phase SSR — Standard, 10A–100A
SSR-DA Series Single Phase Solid State Relay is a DC control AC output solid state relay designed for reliable switching of AC loads. It accepts a 3–32VDC control signal and switches 24–480VAC load voltage, making it suitable for heating equipment, lighting systems, blowers, packaging machines and industrial automation control systems. The SSR-DA series is available in 10A, 25A, 40A, 50A, 60A, 75A, 80A and 100A current ratings.
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SSR-DA Single-Phase SSR — Standard Black Housing, 10A–100A
SSR-DA Series single-phase solid state relays from Beijing Strong Electric offer fast, silent zero-cross switching for AC resistive loads. Control input is 3–32VDC, load output 24–480VAC, with rated current from 10A to 100A. Typical uses are heating equipment, ovens, lighting circuits, packaging machines and temperature control systems.
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BSSR3 Three-Phase SSR — Standard, 40A–120A
The BSSR3 Three Phase Solid State Relay is designed for three-phase AC load control. It uses DC input control and AC output switching, suitable for industrial heating, temperature control, motor control, lighting systems, automation equipment, and power control cabinets. This series includes common current options such as 40A, 60A, 80A, and 100A, with output load voltage typically suitable for 48–480VAC three-phase systems.
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BSSR-DA Single-Phase SSR — Integrated Cover, 10A–120A
BSSR-DA Series Solid State Relay is a single-phase DC-to-AC solid state relay designed for industrial heating, motor control, temperature control systems, automation equipment, and switching applications. It features DC 3-32V control input, AC 24-480V load output, fast switching, stable performance, compact design, and good heat dissipation.
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BSSR-3 Three-Phase SSR — Integrated Cover, 10A–120A
BSSR-3 Series Three-Phase Solid State Relay is an industrial-grade solid state switching module designed for three-phase AC load control. It supports DC-to-AC control and AC-to-AC control options, with rated current choices from 10A to 120A.
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DIN Rail SSR with Integrated Heat Sink, 10A–120A
DIN Rail Mount Solid State Relay is a slim integrated SSR with built-in heat sink, designed for compact industrial control cabinets and DIN rail installation. It supports high-efficiency switching for AC load control, with current options from 10A to 120A. The integrated heat sink improves thermal management, while the slim structure helps save panel space.
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SSR-LA Analog Control SSR — 4–20mA Input, 10A–100A
SSR-LA Series Analog Controlled Solid State Relay is a single-phase solid state voltage regulator module designed for proportional AC load control. It accepts a standard 4–20mA analog input signal and adjusts the AC output voltage accordingly, making it suitable for heating systems, temperature control equipment, fans, packaging machines and industrial automation applications.
View detailsIntegrated SCR Voltage Regulator Modules
Solid state SCR voltage regulator modules with built-in trigger circuit and 4–20mA / 0–10V control for continuous heating power regulation.
BDTY Single-Phase SCR Voltage Regulator
BDTY Series Single-Phase SCR Voltage Regulator is designed for precise AC power regulation of resistive heating loads. It supports multiple analog control signals, including 0–10V, 4–20mA, 1–5V and 10K potentiometer input. With opto-isolated signal and power circuits, compact structure and current options from 10A to 400A, the BDTY Series is widely used in electric heating systems, ovens, packaging machines, plastic machinery and industrial automation equipment.
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BSTY Three-Phase SCR Voltage Regulator 380V, 150A–450A
BSTY Series Three-Phase SCR Voltage Regulator is designed for 380VAC industrial heating and power control applications. It supports phase-angle control, analog signal input, soft start, over-temperature protection and fully isolated control circuits. The series is available from 150A to 450A and is widely used in ovens, drying equipment, blow molding machines, thermoforming equipment, hot runner systems and other three-phase resistive load control applications.
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SCR3L Three-Phase Intelligent SCR Voltage Regulator 60A–200A
SCR3L Series Three-Phase Intelligent SCR Voltage Regulator is an integrated SCR power control module designed for 380VAC three-phase resistive load applications. It combines SCR phase control, signal detection and regulation circuits in one compact module, providing smooth and stable voltage adjustment for industrial heating systems. The SCR3L series supports multiple analog control signals, including 4–20mA, 0–10V, 1–5V and 10KΩ potentiometer control.
View detailsPulse-Triggered SCR Power Modules
SCR power modules driven by the pulse trigger signal of an external heating controller.
SSR Heat Sinks & Accessories
Matched aluminium heat sinks for solid state relays and SCR power modules, selected according to load current, duty cycle and cabinet cooling conditions.
How to select — Solid State Relays & SCR Power Modules
1. Phase and supply voltage
Single phase units suit 220V heaters, sealing bars and small ovens; three phase units suit 380V/415V furnace banks and large dryers. Confirm the supply voltage and whether the load is star or delta connected — the regulator rating must match line voltage, not element voltage.
2. Load current with derating
Size the regulator at 1.5–2× the steady-state load current. Resistive heaters draw a cold-inrush of roughly 1.5×; silicon carbide and molybdenum disilicide elements can draw 3–8× and need a current-limited model.
3. Load type
Nichrome and stainless resistive elements work with any firing mode. Transformer-coupled loads, SiC and MoSi2 elements require phase-angle control with soft start and current limit to avoid saturation and element cracking.
4. Control signal
Choose 4–20mA or 0–10V for PLC and PID controller outputs, 0–5V for analogue instruments, or a manual 4.7k potentiometer for standalone panels. Match the regulator input to the PID controller's linear output card.
5. Firing mode
Phase-angle control gives smooth, continuous power for fast-response and transformer loads. Zero-cross (cycle burst) control reduces electrical noise and suits slow thermal masses such as ovens and tanks.
6. Cooling and protection
Use a properly sized heat sink and thermal compound. Required cooling depends on the actual load current, ambient temperature, duty cycle, enclosure ventilation and heat-sink thermal resistance. Apply appropriate derating. Forced-air cooling may be required for high-current or continuous-duty operation. Add fast-acting semiconductor fuses (aR class) and allow cabinet ventilation.
Industrial applications
Industrial ovens and dryers
Three phase regulators paired with a PID controller and K-type thermocouple hold curing and drying chambers within ±1°C.
Plastic extrusion and injection machinery
Zone-by-zone barrel heating with single phase regulators, replacing contactor switching to extend heater life.
Heat treatment and melting furnaces
Phase-angle units with soft start and current limit drive SiC and MoSi2 elements and furnace transformers.
Packaging and sealing machines
Compact single phase regulators give stable, flicker-free sealing bar temperature at high cycle rates.
Glass, ceramic and laboratory kilns
Smooth ramp and soak control that mechanical contactors cannot provide.
Boilers, tanks and process heating
4–20mA controlled regulators integrate directly into DCS and PLC loops.
Buyer questions
SCR power regulator vs TRIAC regulator — which should I use?
A TRIAC is a single bidirectional device, normally used below about 40A on 220V single phase resistive loads; it is cheaper but has lower surge withstand (I²t) and poorer dv/dt immunity. An SCR (thyristor) regulator uses two anti-parallel thyristors or a thyristor module, handles far higher inrush and continuous current, supports three phase and 500A ratings, and works with transformer, SiC and MoSi2 loads. Use TRIAC for small, steady heaters; use SCR for anything above roughly 40A, three phase, high inrush or continuous duty.
Is a thyristor module the same as an SCR voltage regulator?
No. A thyristor module (for example MTC or SKKT types) is just the power semiconductor — it needs an external firing/trigger board, heat sink and protection. An SCR voltage regulator is the complete assembly: thyristors, trigger circuit, 4–20mA / 0–10V / potentiometer input, soft start and current limit. We supply the complete regulators.
SCR voltage regulator or solid state relay?
An SSR switches fully on or off. An SCR voltage regulator modulates output power continuously from 0–100%, which is required for precise, low-overshoot heating and for transformer or SiC loads.
Which model fits my application?
Single phase 10–100A for sealing bars, small ovens and extruder zones; single phase 100–200A for large 220V heater banks; three phase 40–200A for 380V/415V oven and dryer banks; three phase 200–500A with phase-angle, soft start and current limit for furnaces, SiC/MoSi2 elements and transformer-coupled loads.
What current rating should I order?
Take the load current (kW ÷ voltage, or kW ÷ (1.732 × line voltage) for three phase) and multiply by 1.5–2 for headroom. Send us the load details and we confirm the model before you order.
Do you support OEM and private label?
Yes — custom faceplates, branding, labelling and packaging are available, with mixed-model export shipments and no single-model MOQ walls.
Supply terms
- Lead time
- 3–5 working days
- Warranty
- 12 months
- OEM / private label
- Supported
- Shipping
- Worldwide export
Other product lines
Need help selecting the right model?
Send us the load, voltage, sensor type and output signal. We reply with the matching model, wiring notes and an OEM quotation.