Siemens 3RT5055-6AP36 Standard AC Control Contactor 220-240VAC/DC 150A 3NO

The Siemens 3RT5055-6AP36 is a robust standard AC control contactor engineered for demanding industrial applications, offering a high current rating of 150A and three normally open (NO) contacts. Designed for versatile operation with a 220-240VAC/DC coil voltage, this contactor excels in reliability and performance within motor control, power distribution, and automation systems. Its primary advantages include superior switching capacity, extended electrical endurance, and seamless integration into Siemens' comprehensive industrial control ecosystem. Key technical parameters confirm its suitability for heavy-duty tasks, ensuring efficient and safe electrical circuit management.

Product Specifications

| Feature                | Specification                               |

| :--------------------- | :------------------------------------------ |

| Product Type           | Standard AC Control Contactor               |

| Model Number           | 3RT5055-6AP36                               |

| Coil Voltage           | 220-240 VAC/DC                              |

| Rated Operational Current (AC-3) | 150 A                                       |

| Number of NO Contacts  | 3                                           |

| Auxiliary Contacts     | Configurable (depending on variant/add-ons) |

| Terminal Type          | Screw Terminals                             |

| Enclosure Rating       | IP20 (typical for base unit)                |

| Mounting               | DIN rail or screw mounting                  |

| Operating Temperature  | -25°C to +60°C                              |

| Standards Compliance   | IEC 60947-4-1, UL 508                        |

Core Features & Market Positioning

The Siemens 3RT5055-6AP36 distinguishes itself through its high breaking capacity and exceptional operational reliability, crucial for controlling large industrial motors and power circuits. Its design prioritizes long service life, minimizing downtime and maintenance costs for industrial operations. Positioned as a premium solution in the AC contactor market, it competes effectively against other major manufacturers by offering robust construction, advanced insulation, and a broad operating temperature range that ensures consistent performance in harsh environments. The inherent compatibility with other Siemens automation components further solidifies its value proposition for integrated system solutions.

Key Application Scenarios

This contactor is exceptionally well-suited for direct on-line (DOL) motor starting, reversing applications, and as a main switching device in power distribution boards. Industries such as manufacturing, material handling, HVAC systems, and pump stations frequently utilize the Siemens 3RT5055-6AP36 for its ability to handle substantial inductive loads. Its high current rating makes it an ideal choice for controlling equipment like large conveyor belts, industrial fans, compressors, and water pumps where reliable and frequent switching is paramount. The 220-240VAC/DC coil voltage ensures broad compatibility with common control power supplies found in these sectors.

Practical System Integration Guidance

Integrating the Siemens 3RT5055-6AP36 into existing control panels is straightforward due to its standard DIN rail mounting capability and accessible screw terminals. For motor control circuits, it should be wired in series with the motor and in parallel with the control circuit, typically actuated by a PLC or a control switch. Ensuring the coil voltage matches the control power supply (220-240VAC/DC) is critical for proper operation. Overload protection, usually via a Siemens 3RU overload relay or a soft starter, should be correctly sized and wired in series with the contactor to protect the motor from overcurrent conditions.

Operation and Risk Mitigation

Safe operation of the Siemens 3RT5055-6AP36 requires adherence to electrical safety standards. Always ensure power is isolated before performing any wiring or maintenance. The contactor's IP20 rating indicates it should be installed within an enclosure to protect against accidental contact with live parts. Common troubleshooting involves checking for proper coil voltage, ensuring clean and tight terminal connections, and verifying that the contacts are not welded or pitted due to excessive arcing or overload. Following the manufacturer's guidelines for operational cycles and load ratings will prevent premature failure and potential hazards.

Scalability & Long-Term Value

The Siemens 3RT5055-6AP36 offers excellent long-term value through its compatibility with Siemens' broader industrial automation portfolio, including Sirius motor starters and SIVACON power distribution systems. This allows for seamless upgrades and expansion of control systems. While the base unit is fixed in terms of contact configuration, auxiliary contact blocks and other accessories can often be added to enhance functionality, such as signaling status or enabling more complex control logic. Its robust design ensures a long operational lifespan, reducing the need for frequent replacements and supporting the adoption of digital monitoring solutions for predictive maintenance.

Frequently Asked Questions

What is the primary function of the Siemens 3RT5055-6AP36?

The Siemens 3RT5055-6AP36 acts as an electrically operated switch. It is designed to safely control high-power electrical loads, most commonly industrial electric motors.

This contactor enables remote or automated operation of machinery. It allows control circuits to manage heavy-duty power circuits efficiently.

Its core purpose is to make or break electrical circuits under load conditions, ensuring reliable operation of equipment.

What is the coil voltage for the Siemens 3RT5055-6AP36?

The coil voltage for this specific Siemens contactor model is 220-240 Volts AC or DC. This dual-voltage capability offers flexibility in system design.

It's crucial that the control voltage supplied to the coil matches this range for correct activation. Incorrect voltage can lead to malfunction or damage.

This versatile voltage range ensures compatibility with various standard control power supplies in industrial settings.

Can the Siemens 3RT5055-6AP36 be used for DC applications?

Yes, the Siemens 3RT5055-6AP36 is designed with a dual coil voltage of 220-240 VAC/DC. This allows it to operate effectively on direct current power supplies within that range.

When used in DC circuits, appropriate arc suppression and consideration for DC switching characteristics are important. The contactor is built to handle these requirements.

This dual AC/DC capability enhances its application flexibility, making it suitable for a wider array of control systems.

What is the rated operational current for this contactor?

The Siemens 3RT5055-6AP36 has a rated operational current of 150 Amperes, specifically under AC-3 utilization category. This rating pertains to switching squirrel-cage motors.

This high current capacity makes it suitable for controlling large industrial motors and heavy power loads. It signifies its robust performance in demanding applications.

Users must ensure the connected load does not exceed this 150A rating to maintain operational integrity and longevity.

How many normally open (NO) contacts does the 3RT5055-6AP36 have?

The Siemens 3RT5055-6AP36 is equipped with three normally open (NO) main contacts. These contacts are used for switching the main power circuit.

These three NO poles are essential for three-phase motor control, allowing simultaneous connection and disconnection of all three phases.

While the main contacts are fixed, additional auxiliary contacts can often be added for signaling or interposing functions.

What are the typical applications for the 3RT5055-6AP36?

This contactor is commonly used for motor control applications, including direct-on-line starting. It is also ideal for power distribution and switching heavy inductive loads.

Key industries include manufacturing plants, material handling systems, HVAC, and water treatment facilities. It manages large pumps, fans, and compressors.

Its robust design makes it suitable for frequent switching cycles and demanding operational environments, ensuring reliable performance.

What type of terminals does this contactor use?

The Siemens 3RT5055-6AP36 typically features screw terminals for electrical connections. This provides a secure and reliable connection point for power and control wiring.

Screw terminals allow for firm gripping of conductors, which is essential for high-current applications to prevent overheating or loosening.

Users should ensure proper torque is applied during installation for optimal connection integrity.

Does this contactor require overload protection?

Yes, overload protection is critically important when using the 3RT5055-6AP36 for motor control. It does not include integrated overload protection.

An appropriately sized overload relay, such as a Siemens 3RU series, must be wired in series with the contactor to protect the motor. This prevents damage from overcurrent conditions.

Proper coordination between the contactor and overload relay ensures safety and longevity of the motor and connected equipment.

What is the mounting method for this Siemens contactor?

The Siemens 3RT5055-6AP36 is designed for flexible mounting. It can be easily installed on a standard 35mm DIN rail or directly mounted using screws.

This versatility in mounting options allows for seamless integration into various types of electrical control panels and enclosures.

Proper mounting ensures mechanical stability and secure electrical connections within the system.

What standards does the Siemens 3RT5055-6AP36 comply with?

This contactor complies with major international standards for industrial control equipment. Key standards include IEC 60947-4-1 and UL 508.

Compliance with these standards ensures the product meets rigorous safety and performance requirements for global markets. It assures users of its quality and reliability.

Adherence to these certifications is a testament to its suitability for demanding industrial automation and power control tasks.