Alpha WSS40 5/28 Universal Mechanical Limit Motor

The Alpha WSS40 5/28 Universal is a straightforward 240V mechanical limit tubular motor designed for reliable motorisation of compatible roller blinds and projection screens.

Alpha describes the WSS40 5/28 as:

“A basic featureless 4 core motor for when you want a reliable workhorse without any bells and whistles.”

That description captures the purpose of the WSS range well.

Rather than incorporating electronic limits, rechargeable batteries, built-in radio receivers or advanced programming functions, the Alpha WSS40 5/28 Universal uses a traditional mechanical limit switch.

For installations that simply require dependable wired operation, that simplicity is one of its main advantages.

Mechanical Limit Motor

The defining feature of the Alpha WSS40 5/28 Universal is its mechanical limit switch.

Mechanical limits determine the upper and lower stopping positions of the motor.

The motor head provides the physical mechanical limit adjustment system used during installation to establish the required travel of the roller blind or projection screen.

This is fundamentally different from the Alpha WSEC Series, which uses electronic limit switches.

For customers specifically looking for a conventional mechanical-limit tubular motor, the Alpha WSS40 5/28 provides exactly that.

Simple 4-Core Motor

The Alpha WSS40 5/28 Universal is a basic 4-core wired motor.

There is no need to pay for additional electronic functionality when the installation only requires straightforward motorised operation.

This makes the WSS40 particularly appropriate for installers and customers who value a conventional, uncomplicated motor architecture.

5Nm Rated Torque

The Alpha WSS40 5/28 Universal provides:

5Nm rated torque

combined with:

28 rpm output speed

This combination provides relatively fast operation for compatible roller blind and projection screen applications.

Motor suitability should always be determined according to the complete installation, including the product’s dimensions, weight, tube and configuration.

35mm Diameter Motor

The Alpha WSS40 5/28 Universal uses a compact 35mm diameter tubular motor.

Its total length is 480mm, with a net weight of approximately 1.34kg.

The compact motor body allows it to be incorporated into compatible tubular blind and screen systems while still delivering its specified 5Nm torque.

Maximum 40 Turns

Alpha specifies a maximum of 40 turns for the WSS40 5/28 Universal.

This specification should be considered when determining whether the motor is appropriate for the required travel of the particular blind or projection screen.

Cannot Be Parallel Wired

This is another important characteristic of the WSS Series:

Alpha WSS motors cannot be parallel wired.

This is a significant difference between the WSS and WSEC ranges.

If an installation specifically requires parallel wiring, the appropriate Alpha WSEC motor should be considered instead.

The WSS40 should therefore be selected where its conventional individual 4-core wired configuration suits the control system.

Designed for Roller Blinds

Alpha identifies roller blinds as one of the primary applications for the Alpha WSS40 5/28 Universal.

Its mechanical limits and simple wired architecture make it suitable for installations where conventional powered roller blind operation is required without additional electronic motor features.

Designed for Projection Screens

Alpha also specifies projection screens as an application for the WSS40 5/28.

The mechanical limit system establishes the required upper and lower travel positions, providing straightforward motorised raising and lowering of a compatible projection screen.

Reliable Mechanical Simplicity

The Alpha WSS40 5/28 Universal isn’t intended to compete on the number of electronic features it contains.

Its purpose is almost the opposite.

It’s designed to provide a simple 240V motor, mechanical limits and reliable 4-core operation without unnecessary additional functionality.

For the right application, that simplicity can make the WSS40 an attractive motor choice.

Technical Specifications

• Model: Alpha WSS40 5/28 Universal
• Product Code: WSS40528
• Motor Type: Mechanical limit tubular motor
• Power Supply: 240V
• Wiring: 4-core
• Limit Type: Mechanical limit switch
• Rated Torque: 5Nm
• Output Speed: 28 rpm
• Nominal Consumption: 116W
• Nominal Voltage: 240V
• Nominal Current: 0.49A
• Running Time: 4 minutes
• Protection Index: IP44
• Motor Diameter: 35mm
• Total Length: 480mm
• Maximum Turns: 40
• Net Weight: 1.34kg
• Parallel Wiring: No
• Included C&D: A2310
• Included Motor Bracket: A3304
• Applications: Roller blinds and projection screens

Important: Mechanical vs Electronic Limits

The Alpha WSS40 5/28 Universal uses mechanical limits.

It should not be confused with the Alpha WSEC40 5/28 Universal, which uses an electronic limit switch.

The distinction is:

Alpha WSS40 5/28 → Mechanical limits

Alpha WSEC40 5/28 → Electronic limits + parallel wiring compatibility

That distinction should be prominent because somebody searching these model numbers could otherwise easily confuse the two.

Related Alpha Motor

Alpha WSEC40 5/28 Universal

This is actually a useful internal link from the WSS page.

Customers who require electronic limits or parallel wiring compatibility can view the Alpha WSEC40 5/28 Universal instead.

Conversely, the WSEC page could link back to this motor for customers specifically wanting a simpler mechanical-limit motor.

Electrical Installation

The Alpha WSS40 5/28 Universal is a 240V motor.

Electrical installation and connection must comply with applicable Australian electrical requirements and be carried out by appropriately licensed personnel where required.

FAQs

Is the Alpha WSS40 5/28 a mechanical limit motor?

Yes. The Alpha WSS40 5/28 Universal uses a mechanical limit switch to establish the motor’s upper and lower stopping positions.

What is the Alpha WSS40 5/28 designed for?

Alpha lists roller blinds and projection screens as the key applications for this motor.

How powerful is the Alpha WSS40 5/28?

It provides 5Nm of rated torque and operates at 28 rpm.

Is the Alpha WSS40 5/28 a 240V motor?

Yes. It is a 240V 4-core wired tubular motor.

Can the Alpha WSS40 5/28 be parallel wired?

No. Alpha specifically states that WSS Series motors cannot be parallel wired.

What’s the difference between the Alpha WSS40 5/28 and WSEC40 5/28?

The WSS40 uses mechanical limits and cannot be parallel wired. The WSEC40 uses electronic limits and supports parallel wiring.

How many turns does the Alpha WSS40 5/28 support?

Alpha specifies a maximum of 40 turns.