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MKD2 dual channel SSR black housing terminal type

Single Phase Dual Channel DC to AC Solid State Relay

The MKD2 Series is a single-phase, dual-channel, DC-controlled AC solid state relay (SSR) designed for reliable, silent switching of resistive and inductive AC loads in industrial and commercial control systems. Each unit houses two independent switching channels within a single compact black housing, enabling two separate AC loads to be controlled simultaneously from a single device — saving panel space and wiring time compared to installing two separate SSRs.

The MKD2 accepts a DC control voltage of 4–32 VDC, making it directly compatible with PLC outputs, microcontroller I/O, and standard industrial control signals. The AC load side supports voltages from 24 to 480 VAC, covering 110 V, 220 V, 380 V, and 480 V systems worldwide. Load current ratings of 25 A, 40 A, 60 A, and 80 A are available, with all variants sharing the same physical footprint for easy interchangeability.

Zero-crossing trigger technology ensures that switching occurs at the natural zero-crossing point of the AC waveform, minimising electrical interference (EMI) and extending the service life of both the relay and the connected load. Individual LED status indicators for each channel provide instant visual confirmation of relay state, simplifying commissioning and fault-finding. The unit is CE certified and constructed from fire-retardant ABS with a dielectric strength of 2500 Vrms between input, output, and base.

Item no.:
MK D2
Payment:
T.T, Credit Card, Paypal etc, to be negotiate
Market price:
$16
Price:
$8
Product origin:
Made in China
Color:
black
Min order:
10 PCS
Product weight:
0.1kg
Lead Time:
14 days after payment confirmed

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Electrical Specifications

Parameter	Specification
Load Voltage	24–480 VAC
Control (Input) Voltage	4–32 VDC
Minimum Turn-On Voltage	4 VDC
Minimum Turn-Off Voltage	1 VDC
Maximum Input Current	12 mA
Minimum Input Current	7 mA
Maximum Turn-On Time	10 ms
Maximum Turn-Off Time	10 ms
Maximum Off-State Leakage Current	5 mA (at rated voltage)
Maximum On-State Voltage Drop	1.5 V (at rated current)
Minimum Off-State dV/dt	1000 V/µs (at maximum rated voltage)
Dielectric Strength (50/60 Hz)	Input/Output ≥ 3500 Vrms
Dielectric Strength (50/60 Hz)	Input/Output/Base ≥ 2500 Vrms
Transient Overvoltage	1200 Vpk
Trigger Mode	Zero-crossing
Number of Channels	2 (dual channel)

Mechanical and Environmental Specifications

Parameter	Specification
Operating Temperature	−30 °C to +85 °C, 35–85% RH
Storage Temperature	−40 °C to +125 °C
Housing Material	Fire-retardant ABS
Housing Colour	Black
Weight	0.1 kg
Mounting	Panel mount (2 × ø10.5 mm fixing holes)
Input Connection	Screw terminal (green plug-in connector)
Output Connection	Screw terminal
Status Indication	LED indicator per channel (2 total)
Certification	CE

Physical Dimensions

Dimension	Value
Width	58 mm
Depth	44.6 mm
Height	37.5 mm
Mounting hole spacing	47.5 mm

The MKD2 ordering code is structured as follows:

MK - [1: Load Current] - [2: Input Type] - [3: Number of Channels]

Field	Code	Description
Prefix	MK	PIDMaxWell solid state relay series
1: Load Current	25 40 60 80	25 amps 40 amps 60 amps 80 amps
2: Input Type	D	DC input, AC load
3: Channels	1 2	Single channel Dual channel

Click on below link to download catalog, user manual for MK D2

MK D2 Catalog

The MKD2 dual-channel SSR is well suited to a wide range of temperature control and switching applications:

Temperature Control Systems. The MKD2 is an ideal output device for PID temperature controllers in industrial ovens, furnaces, kilns, and environmental test chambers, where two independently controlled heating zones can be managed from a single relay module.

Plastic and Rubber Processing Machinery. Injection moulding machines, extruders, and hot-runner systems require precise, silent switching of multiple heating zones. The MKD2’s dual-channel design reduces component count and panel space in these applications.

HVAC and Building Automation. The MKD2 can switch electric heating elements, fan coil units, and auxiliary heating circuits in commercial HVAC systems, with the LED indicators providing clear operational status for building management personnel.

Incubation and Agricultural Equipment. Poultry incubators, germination chambers, and greenhouse heating systems benefit from the MKD2’s zero-crossing switching, which minimises electrical noise that could interfere with sensitive monitoring equipment.

Industrial Machinery and OEM Equipment. The compact, panel-mount form factor and universal 24–480 VAC load voltage range make the MKD2 suitable for integration into a wide variety of OEM machines, including oiling machines, conveyor systems, and packaging equipment.

Lighting Control. The MKD2 can be used for switching AC lighting circuits, including stage lighting, signage, and industrial work-area lighting, where silent operation and long service life are required.

Fountain and Water Feature Controllers. The dual-channel capability allows simultaneous independent control of pump motors and lighting circuits in decorative fountain and water feature installations.

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