Selecting a Panasonic KNX Switching Actuator by Channel Count and Load

Selecting a Panasonic KNX switching actuator begins with the circuit schedule rather than a product headline. Channel quantity is the first filter, but a responsible specification also distinguishes a relay-based mix actuator from a genuine dimming output. Panasonic offers several mix-actuator groups alongside a dedicated DM104 dimmer. Their roles are different, and the control method matters as much as the model name.

A useful bill of quantities lists each independent lighting circuit, shutter or blind motor, heating output and other controlled load, together with the electrical characteristics of that load. From this schedule, an integrator can choose the channel count and functional grouping that fit the building, then cross-check the exact model against Panasonic technical material. Browse the Panasonic KNX product range or the switching actuator category alongside the documented product options below.

Switching, mix control and dimming: choose the function first

A switching actuator controls the connected circuit by opening or closing an electrical output. A mix actuator extends the application to configurable building-control functions such as lighting switching and, where supported by the identified model and application, shutter and HVAC-related outputs. That does not turn its relay outputs into variable-voltage dimmers. Brightness regulation requires a compatible dimming actuator or a separate dimming interface matched to the driver and lamp.

For the WRKT46 group, Panasonic’s KNX Mix Actuator reference manual identifies models MX112, MX116, MX120 and MX124 by exact product code. Its application material distinguishes switching-lighting control from other output configurations. The WRKT47 installation guide likewise identifies the MX208 and MX220 variants in its product-version table. These are appropriate starting points when selecting controlled loads and assigning a clear output function to each circuit.

Identify the required channel count

Channel count should represent the number of independent actuator outputs needed after the control functions are allocated. In practical panel design, several luminaires connected to one switched circuit normally require one control output, whereas independently controlled circuits require separate outputs. Motor-control functions can consume more than one relay output. An installer should therefore finalize the circuit and function allocation before converting the lighting plan into the actuator schedule.

WRKT46 mix actuators

The Panasonic WRKT46 reference manual names the following exact models, providing an SKU-based starting point for channel planning:

• Panasonic KNX Mix Actuator 12 Channels MX112 WRKT4612J5NC — 12-channel MX112 mix actuator.
• Panasonic KNX Mix Actuator MX116-16A (WRKT4616Q5NC) — 16-channel MX116 mix actuator.
• Panasonic KNX Mix Actuator 20 Channels MX120 16A (WRKT4620Q5NC) — 20-channel MX120 mix actuator.
• Panasonic KNX Mix Actuator 24 Channels MX124 16A (WRKT4624Q5NC) — 24-channel MX124 mix actuator.

These models are best assessed against a detailed control schedule that distinguishes independent switched circuits from paired or grouped motor-control operations. The model with more physical outputs is not automatically the most efficient choice: what matters is how many outputs remain available after every required control function has been allocated. Reviewing the switching functions and motor grouping in the exact-series Panasonic reference manual prevents channel-count decisions based on the number of rooms alone.

WRKT47 mix actuators

Panasonic also documents the Panasonic KNX Mix Actuator 8 Channels MX208 16A – WRKT4708J5NC and Panasonic KNX Mix Actuator 20 Channels MX220 16A (WRKT4720Q5NC). The corresponding installation guide lists eight and twenty switching-lighting outputs respectively, together with additional application categories in the product-version matrix. An eight-output unit can suit a compact set of independently controlled circuits, while a twenty-output device supports a larger scheduled allocation. The correct selection is determined by the final output map, not by assuming every building system consumes an identical number of terminals.

During design review, label each circuit with its panel location, protective device, load type, control function and desired group-address mapping. Separate the physical output schedule from software scenes: a scene can change how many outputs respond together without increasing the number of physical circuits an actuator can switch.

KNX Secure mix actuators: WRKT48 selection

Panasonic’s KNX Secure mix-actuator range is documented by exact product codes in its 2026 KNX catalogue. The line is described as combining encrypted KNX communication with switching and other building-control functionality. For projects with a defined KNX Secure architecture, the control and commissioning plan should make that requirement explicit before the hardware schedule is approved.

• Panasonic Secure Mix Actuator 8 Channel 16A (WRKT4808J5NC) — eight output channels, MX308-16A-S.
• Panasonic KNX Secure Mix Actuator 12 Channels MX312 16A -S (WRKT4812J5NC) — twelve output channels, MX312-16A-S.
• Panasonic Secure Mix Actuator 16 Channel (WRKT4816J5NC) — sixteen output channels, MX316-16A-S.
• Panasonic Secure Mix Actuator 24 Channel 16A (WRKT4824J5NC) — twenty-four output channels, MX324-16A-S.

The separate KNXbazzar catalogue entry Panasonic MX324-16A-S KNX Secure Mix Actuator 24 Channels uses the model designation MX324-16A-S. Panasonic uses MX324-16A-S as the model designation associated with manufacturer product code WRKT4824J5NC in its official catalogue. For the confirmed WRKT48 variants, Panasonic’s catalogue states a 16 A nominal channel-output class. As with any relay-based switching design, the actual connected load must be checked against its type-specific limits and protective arrangement rather than selected by the headline amperage alone.

A dedicated dimming option: Panasonic DM104

The Panasonic KNX Dimming Actuator 4 Channel 250W DM104 (WRKT5414J5NC) is the distinct four-output DM104 dimming actuator. Panasonic’s exact-SKU datasheet includes a load-type matrix for capacitive phase-cut-off and inductive phase-cut-on operation. These phase-control methods must correspond to the connected lamps or transformer characteristics. A dimmer is appropriate where gradual light-level adjustment is required; a relay switch is appropriate where the required function is simply energizing or isolating a circuit.

The manufacturer’s KNX building automation catalogue specifies DM104 maximum-load figures by connected load type: 250 W for incandescent/high-voltage halogen lighting, reduced to 200 W in inductive mode; the LED/CFL table gives 250 VA in the applicable operating mode and 30 VA in inductive mode. The published ratings use a 25°C ambient and 230 V AC/50 Hz reference condition, with derating above 25°C. They are therefore not a single universal wattage for all electronic drivers.

For dimming schedules, record the LED driver or lamp model, electrical loading, intended dimming curve and phase-control compatibility. Choose the load mode on the basis of Panasonic’s compatible-load matrix, then test minimum brightness, transitions and the final connected combination during commissioning. Avoid treating the DM104’s four dimming outputs as equivalent to four high-current switching relays.

Build the actuator schedule from the project load list

A reliable KNX actuator selection workflow connects the electrical design to ETS engineering and physical panel assembly. First, identify circuit boundaries and the number of separately controlled outputs. Next, assign the intended function for each circuit. Then classify switching duty, motor duty and dimming duty so that outputs are selected by electrical behavior instead of by room name. Finally, reconcile the output allocation with the selected device’s manufacturer documentation and the available panel space.

• Lighting switching: map each independently controlled circuit to a suitable switching output; list the lamp driver type and switching characteristics.
• Blinds and shutters: reserve the correct output grouping for direction and motor control, and implement the interlocking required by the chosen device and motor arrangement.
• HVAC-related outputs: distinguish valve, fan-stage and auxiliary-control signals so their individual output assignments remain clear.
• Dimming: treat dimming output capacity, compatible lamp technology and the chosen phase-control method as separate checks.
• KNX commissioning: pair each physical output with its application function and group-address scheme, then verify feedback and intended manual operation.

The quantity in a circuit list can diverge from the quantity of actuator outputs: for instance, grouped loads can respond together, and some motor applications need paired terminals. A useful project schedule therefore contains both a circuit identifier and a physical-output identifier. This makes panel wiring inspections and future maintenance considerably easier.

Comparison for procurement and panel design

The following table uses documented channel counts for the exact Panasonic SKUs. It deliberately separates the dimming actuator from the mix-actuator families, because channel quantity alone does not convey output type.

The Panasonic MX324-16A-S KNX Secure Mix Actuator 24 Channels is additionally available as a separate product listing. Procurement records should consistently distinguish the manufacturer’s WRKT order code from the MX model designation when checking purchase orders and physical device labels.

Electrical and commissioning checks that protect the project

A relay rating is not a substitute for an LED driver’s inrush-current profile, load power factor or motor switching characteristics. A channel may be acceptable for a resistive load yet require a different design decision for an electronic lighting driver. Assess the actual load category, protection and manufacturer switching instructions before energizing the circuit. Use the same discipline when selecting a dimming channel: compatible phase-control method and maximum load by lamp technology take precedence over the nominal model label.

For KNX Secure projects, align the equipment selection with the project’s commissioning and key-management strategy. For all variants, keep the final ETS project, output schedule, cabinet circuit labels and as-built documentation consistent. A structured acceptance test should verify local output operation, KNX telegram control, the intended scene behavior and load operation under normal conditions.

Final selection guidance

For ordinary relay-based lighting and other configured output functions, start with the KNX mix-actuator channel schedule and use the WRKT46 or WRKT47 model that matches the required physical outputs. Consider the WRKT48 Secure models when secure KNX communication forms part of the specified system architecture. For genuine brightness control, evaluate the WRKT5414J5NC DM104 against the exact lamp or driver type and Panasonic’s mode-specific load limits. A carefully mapped circuit schedule, supported by the Panasonic KNX product catalogue, produces a clearer bill of materials and a more maintainable KNX installation.