Isolated Type 16 Channel Relay Module Interface Board High/Low Level Trigger (DC 5V) Isolation Type 16 Channel Relay Module can select high-level or low-level signal triggering, and only needs 5mA current to drive the relay with 10A control capability to pull in. The module adopts genuine high-quality power relay, high-quality small-sized package optocoupler, high-power high dielectric strength triode, red and blue signal indicator, military-grade double-sided PCB board, and with reasonable layout and stable performance, can be widely used in a variety pf powers control. Features: 1. With power supply reverse connection function to prevent damaging the module. 3. Using small-sized two-way isolated optocoupler, with strong anti-interference ability and stable performance; trigger current is only 5mA. 4. Users can select the control level of the relay, which can be high level pull-in or low level pull-in. 5. The module has built-in finite current resistor. The positive and negative pole control of the power supply can be used directly, or use the I/O port of the single-chip to control. 6. Power indicator (red), relay status indicator (blue) 7. User-friendly interface design, all interfaces can be directly connected by the wiring terminals, very convenient. 8. Designed with 4 3mm fixed bolt holes for easy mounting.   Specification: Trigger current: 5mA Mounting hole diameter: 3mm Module size (L*W*H): 15.3*10*2.0cm /  6.0*3.9*0.8in Package weight: Approx. 246g/8.7oz Module interface: Module control interfaces have 16 wiring terminals. 2. DC-: Connect to DC power supply - 3. XM: Common terminal of optoelectronic isolation chip If use high level control: This interface should be connected to the negative pole of control board power supply. If use low level control: This interface should be connected to the positive pole of control board power supply. 4. X1-X16: Relay control interface Relay output interfaces have 48 wiring terminals. 1. NO1-NO16: Normally open interfaces of the relays 2, COM1-COM16: Common interface of the relays 3. NC1-NC16: Normally closed interfaces of the relays   Package list: 1 * 16 Channel Relay Module