Aoyi Solid State Relay (SSR) – SSR-25DV / SSR-40DV (220VAC, 250VAC load range)

The SSR-25DV and SSR-40DV are single-phase solid state relays (SCR-type voltage regulator SSR) used for switching and controlling AC loads in industrial systems.

General specifications

• Brand: Aoyi
• Models: SSR-25DV / SSR-40DV
• Load voltage range: 175 – 250VAC (commonly used at 220VAC systems)
• Control mode: DC voltage regulator input (typically 3–25 mA / low DC signal)
• Output type: AC solid state switching (SCR / triac-based)
• Phase: Single phase
• Installation: Panel mounting with screw terminals

Current ratings

• SSR-25DV: 25A output current
• SSR-40DV: 40A output current

Load capability (typical at 220V)

• 25A model: up to ~2.8 kW resistive load
• 40A model: up to ~4.4 kW resistive load

Function

• Controls AC power without mechanical contact (no relay noise, no wear contacts)
• Used for:
  • Heater control systems
  • Temperature controllers
  • Industrial ovens
  • Plastic machinery
  • Automation heating elements

Key characteristics

• Fast switching (no mechanical delay)
• Long service life (no moving parts)
• Built-in LED indicator (input signal status)
• Requires proper heat sink for 25A and 40A operation
• Low voltage control input drives high voltage AC load

Important installation notes

• Must use heat sink + thermal paste for continuous load
• Do not exceed rated current for inductive loads (motors/pumps require derating)
• Ensure proper ventilation in control panel
• Load wiring must match correct terminal polarity and tightening torque

Summary

Aoyi SSR-25DV and SSR-40DV are industrial SCR-based solid state relays designed for 220VAC heating and control applications, offering reliable and maintenance-free switching for medium to high power electrical loads.