Toky RMA-40A400 model  solid state relay has 2 kinds of turn-on version: Zero-cross and Random. Zero-cross turn-on version is energised when voltage meets the zero point (about +/- 15V) and disenergised when current meets the zero point, depending on the signal control on the input circuit. Random turn-on version is energised when input valid control signal, and if not iput signal it is disenergised until the load current less than the holding current. Technical specification: 1) Static dV/dt (Off-state): 100V/us. 2) Dynamic dV/dt (On-state): 20V/us. 3) On-State Voltage Drop (Max.): 2V. 4) Switching voltage for zero: 15V. 5) Isolation: 2,000Vac minimum. 6) Operating Temperature Range: -30 to 75 C 7) Turn-On Time (Max.): 10ms. 8) Turn-Off Time (Max.): 10ms. 9) Nominal frequency: 50/60Hz

• Rated voltage: 400V, Rated current: 40A 
• 5-32V DC control SSR 
• Random/Zero-cross active
• http://www.elnu.se/pdf_info/TOKY_SSR-1_8.pdf

Rated voltage: 400V, Rated current: 40A Toky