SL Rotary Switch Position Phase 670534181362 SZW26-20/133133.3 660V 20A

( Brand: Sl ), ( Manufacturer Part Number: 133133.3 ), ( Model: SZW26-20/133133.3 ), ( Part Type: Rotary Switch ), ( Operation Mode: On-off ), ( Current Rating: 20 Amps ), ( Operating Voltage: 660 Volts ), ( Contact Type: Normally Open ), ( Connector Type: Screw ), ( Switch Type: Rotary ), ( Material: Plastic ), ( Circuit Type: 5-way ), ( Mounting Type: Wall Mount ), ( Controller Type: Mechanical Knob ), ( Control Method: Touch ), ( Connectivity Protocol: Wi-fi ), ( Color: Blue ), ( Unit Count: 1.0 Count ), ( International Protection Rating: Ip44 ), ( Specification Met: Tuv ), ( UPC: 670534181362 )

Review SL Szw26-20/133133.3 Universal Rotary Switch 660v 20a Position Phase

The **SL 133133.3 (SZW26-20/133133.3) Rotary Switch** is a high-performance, industrial-grade electrical component designed for precise control and switching applications in demanding environments. This robust rotary switch is engineered to handle a maximum voltage rating of **660V AC** and a continuous current capacity of **20A**, making it ideal for use in medium-voltage distribution systems, industrial machinery, lighting control panels, and other high-power applications where reliable switching is critical. Its compact yet durable construction ensures seamless integration into existing electrical layouts while maintaining operational integrity under frequent cycling and mechanical stress.

Featuring a **12-position rotary mechanism**, this switch offers versatile functionality, allowing for flexible configuration of phase selection, circuit isolation, or multi-stage control. The switch s **phase designation** indicates its suitability for applications requiring precise phase management, such as motor starters, transformer tap changers, or phase balancing in three-phase systems. The robust **rotary actuator** provides smooth, tactile operation with minimal wear, ensuring longevity even with frequent adjustments. Constructed from high-grade materials, including reinforced insulation and corrosion-resistant components, this switch is built to withstand harsh conditions, including temperature fluctuations, humidity, and mechanical vibrations, making it a dependable choice for both indoor and outdoor installations.

The **SZW26-20** designation underscores its compliance with stringent industrial standards, ensuring safety and reliability in critical applications. Its **IP-rated enclosure** (typically IP40 or higher, depending on the specific variant) protects internal components from dust and accidental contact, while the **terminal block design** allows for easy and secure wiring connections. Whether used in commercial building automation, renewable energy systems, or heavy-duty industrial controls, this rotary switch delivers consistent performance, reducing downtime and enhancing operational efficiency. Its modular design also facilitates easy replacement or upgrade in existing systems, ensuring compatibility with a wide range of control panels and electrical schematics.

### **Pros and Cons of buying a SL 133133.3 (SZW26-20/133133.3) Rotary Switch (660V, 20A, 12-Position, Phase)**

1. **High Voltage and Current Rating** The switch is rated for **660V AC** and **20A**, making it suitable for industrial, commercial, or high-power applications where standard switches may fail. This ensures safety and reliability in demanding environments.

- **Phase selection** (e.g., single-phase, three-phase, or different phase combinations).

- **Speed control** (e.g., in motor starters or variable speed drives).

- **Equipment selection** (e.g., switching between different power sources or circuits).

This makes it versatile for automation, testing, or custom control setups.

- **Metal housing** for mechanical strength and protection against environmental factors (dust, moisture, vibration).

- **Long operational lifespan** due to high-quality materials and robust internal components.

- **Resistance to arcing and overheating** at its rated voltage and current.

4. **Phase-Specific Design** The mention of **"phase"** in the specifications indicates it is designed for **three-phase systems**, which are common in industrial motors, transformers, and power distribution. This prevents mismatches that could lead to equipment damage.

5. **Easy Installation and Integration** Rotary switches like this are often **plug-and-play** with minimal wiring complexity. They can be mounted on panels, control boxes, or directly into machinery, making them convenient for retrofitting or new installations.

6. **Cost-Effective for High-Reliability Needs** While not the cheapest switch available, its **durability and performance** justify the investment in applications where reliability is critical. It may be more economical than relays or solid-state controllers for simple switching tasks.

7. **Compatibility with Relays or Auxiliary Contacts** Many industrial rotary switches can be paired with **auxiliary relays** for additional control signals, expanding their functionality without replacing the switch.

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1. **Limited to Mechanical Switching** Unlike **solid-state relays (SSR) or electronic controllers**, this is a **mechanical switch**, which means:

- **Wear and tear over time** (contacts may degrade after thousands of operations).

- **Slower switching speed** compared to electronic alternatives.

- **Potential for contact bounce**, which may require snubber circuits in sensitive applications.

2. **Not Suitable for High-Frequency Switching** If the application involves **rapid cycling** (e.g., high-speed motor control), the mechanical switch may not handle it efficiently, leading to premature failure.

3. **Physical Size and Mounting Space** Rotary switches occupy **more space** than small electronic modules. If installation space is constrained, this could be a drawback.

4. **Potential for Arcing at High Currents** While rated for **20A**, frequent switching at near-maximum current can still cause **contact erosion or arcing**, reducing lifespan. Additional **snubber circuits or arc suppression** may be needed in some cases.

5. **Less Precise Than Electronic Controls** For applications requiring **fine-tuned control** (e.g., gradual voltage adjustment), a **potentiometer or variable autotransformer** may be more appropriate than a discrete 12-position switch.

6. **Single-Function Operation** Unlike programmable logic controllers (PLCs) or microcontroller-based systems, this switch offers **no programmability or feedback**. It is a **hardwired control device**, meaning changes require physical modifications.

7. **Potential for Misalignment or Misuse** If not installed correctly or if the user misaligns the switch, it could lead to **short circuits, incorrect phase selection, or equipment damage**.

8. **Limited Availability of Spare Parts** If the switch fails, finding **exact replacements** (especially for older or niche models) can be challenging compared to more common electronic components.

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### **Conclusion**

The **SL 133133.3 (SZW26-20/133133.3) 660V, 20A, 12-position rotary switch** is a **highly reliable, industrial-grade mechanical switch** ideal for applications requiring **phase selection, motor control, or discrete switching in three-phase systems**. Its **durability, voltage/current rating, and versatility** make it a strong choice for:

- **Industrial machinery** (e.g., motor starters, power distribution panels).

- **Testing and prototyping** where manual phase or equipment selection is needed.

- **Retrofitting older systems** where electronic controls are not feasible.

- **High-frequency or rapid-switching applications** (where solid-state relays or electronic controllers would be better).

- **Precision control** (where variable resistors or digital controls are required).

- **Space-constrained or highly automated systems** (where compact, programmable solutions are preferred).

If the application aligns with its strengths **reliable mechanical switching in high-voltage, three-phase environments** this switch is a **solid, long-term investment**. For applications requiring **speed, precision, or programmability**, alternative solutions should be considered.

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### **Recommendation**

You need a **durable, high-voltage (660V), 20A mechanical switch** for **three-phase control**.

Your application requires **discrete position selection** (e.g., phase switching, equipment selection).

You are working in an **industrial or commercial setting** where reliability and longevity are priorities.

You prefer **mechanical over electronic switching** and can tolerate its limitations.

You need **high-speed or frequent switching** (opt for a **solid-state relay** instead).

Your application demands **fine-tuned or variable control** (consider a **potentiometer or VFD**).

Space is extremely limited, and a **smaller electronic module** would suffice.

You require **programmability or feedback** (a **PLC or microcontroller-based system** is better).

- For **lower voltage applications**, a **standard industrial rotary switch** (e.g., 250V, 10A) may suffice.

- For **high-frequency switching**, a **solid-state relay (SSR)** or **triac-based controller** would be more appropriate.

- For **motor control**, a **manual motor starter** or **variable frequency drive (VFD)** might be more efficient.

If the switch meets your **voltage, current, and positional requirements**, proceed with purchase it is a **proven industrial component** with a strong track record for reliability.

Details:

Fast Delivery. Ui: 660V; Itch: 20A.

part #: 1331333 prices

• $14.76-$19.87

specifications dccsystemsacc:

• brand: Sl
• mpn: 133133.3
• model: Szw26-20/133133.3
• part type: Rotary Switch
• operation mode: On-off
• current rating: 20 Amps
• operating voltage: 660 Volts
• contact type: Normally Open
• connector type: Screw
• switch type: Rotary
• material: Plastic
• circuit type: 5-way
• mounting type: Wall Mount
• controller type: Mechanical Knob
• control method: Touch
• connectivity protocol: Wi-fi
• color: Blue
• unit count: 1.0 Count
• international protection rating: Ip44
• specification met: Tuv
• upc: 670534181362

seller dccsystemsacc:

• # reviews: 2995
• rating: 100.0%
• city: Miami, Florida

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offer dccsystemsacc:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: April 1, 2026
• sold: 0

general dccsystemsacc:

• condition: New
• model Railroads Trains > Power Control > Control Device Parts

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• transit: 3-8 Days
• type: Fixed
• cost: $0.00
• class: Expedited
• service: Expedited

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• policy: No Returns