General
Degree of protection	IP 65
Max. operating current	32 A
Mounting type	Front fastening
Terminal type	Continuous
Accessory compatibility	3LD9221-2A terminal cover
Application area	Main and emergency stop switch 3LD2

The Siemens neutral conductor/PE terminal 3LD9220-2B is an accessory for main and emergency stop switches of the 3LD2 series, specifically designed for front mounting on switches. It serves as a continuous terminal for connecting neutral conductors (N) or protective earth conductors (PE) and is rated for current strengths up to 32 A. The product is part of a modular system that enables flexible and quick installation of auxiliary switches, additional poles, or N-PE terminals. The terminal is used in installations where safe disconnection of loads is required, for example in three-phase motors, climate and ventilation systems, and in processing and manufacturing machines of the machinery and conveyor systems industry. It is also used in the chemical industry or in the food and beverage industry, where high safety requirements apply.

Applications

The terminal is designed for use in industrial installations where a reliable and safe connection of neutral or protective conductors is required. It is particularly used in switchgear equipped with main and emergency stop switches of the 3LD2 series. These switches are used for the safe disconnection of electrical loads and are employed in many industries, including manufacturing, packaging and processing technology, and process automation. The terminal is suitable for applications requiring a permanent, mechanically stable connection and supports network disconnection in installations with a rated current of 16 A to 250 A.

Functions and Equipment in Detail

The terminal is designed as a continuous variant, meaning it runs the entire length of the switch and thus enables a continuous connection. It is intended for front mounting on switches of the 3LD2 series, allowing for easy and quick installation without additional tools. The terminal is part of a modular system that enables flexible expansion of switch functions, for example by attaching auxiliary switches or additional poles. The use of N-PE terminals supports the safe separation of network and protective conductors, which is important for electrical safety in industrial installations.

Technology Explained Simply

The terminal is rated for a maximum operating current of 32 A, making it suitable for a wide range of industrial applications. Front mounting allows for easy integration into existing switchgear without requiring additional mounting elements. The continuous design ensures a mechanically stable and electrically reliable connection that remains intact even under mechanical stress or vibration. The terminal is part of a system that enables locking of the rotary drive, providing additional safety during network disconnection. The IP 65 protection rating, applicable to the encapsulated housing of the switches, makes the installation suitable for outdoor use, as it is dust-tight and splash-proof.

Compatibility and Accessories

The terminal is specifically developed for main and emergency stop switches of the 3LD2 series from Siemens. It is compatible with switches designed for front mounting and can be used in combination with other modules such as auxiliary switches or additional poles. As suitable accessories, the terminal cover 3LD9221-2A is offered, designed for 3LD2 series switches with 25 A and 32 A. This cover provides mechanical protection reinforcement and can be used to improve safety during operation. The terminal is part of a system that is globally applicable, as it has international approvals such as IEC, UL, CCC, and shipbuilding approvals.

Mounting and Installation

The terminal is mounted on the front side of the 3LD2 switch, with no additional mounting elements required. The terminal is inserted directly into the designated mounting openings and is secured by the switch's construction. The modular design enables quick and easy installation without requiring additional tools or special skills. The terminal is designed for permanent use in industrial environments and requires no special maintenance measures.

Advantages in Operation

The terminal provides a reliable and safe connection for neutral or protective conductors, increasing electrical safety in the installation. The modular design enables flexible expansion of switch functions, allowing adaptation to specific requirements in a simple and cost-efficient manner. Front mounting and the continuous design ensure a stable installation that remains intact even under mechanical stress. The IP 65 protection rating makes the installation suitable for outdoor use, expanding its range of applications. International approval enables use in various countries and industries without requiring additional certifications.