General
Release characteristic	Z
Number of poles (total)	1
Number of protected poles	1
Rated current	20
Rated insulation voltage Ui	440
Rated impulse withstand voltage Uimp	4
Rated short-circuit breaking capacity Icn EN 60898 at 230 V	6
Voltage type	AC/DC
Frequency	60
Current limiting class	3
Over voltage category	3
Pollution degree	3
Width in number of modular spacings	1
Built-in depth	69
Degree of protection (IP)	IP20
Ambient temperature during operating	55
Connectable conductor cross section multi-wired	25
Connectable conductor cross section solid-core	35
Power loss	2.4
Concurrently switching N-neutral
Additional equipment possible
Explosion-proof
Flush-mounted installation

The ABB circuit breaker type S201-Z20 is a 1-pole circuit protection switch with Z-characteristic, designed for use in electrical installations to provide protection against overload and short circuit. It belongs to the S 200 series and is designed for indoor use, with protection class IP20 ensuring shock protection for permanently installed devices. The rated current is 20 A, and the device is designed for a rated insulation voltage of 440 V. The rated impulse withstand voltage is 4 kV, providing sufficient insulation strength for typical applications in low-voltage installations. Energy limitation class 3 and overvoltage category 3 indicate the device's ability to provide adequate protection against transient voltage surges. The maximum ambient temperature during operation is 55 °C, enabling use in standard indoor installations.

Applications

The circuit breaker S201-Z20 is intended for use in electrical installations in accordance with DIN VDE 0100-430 and DIN VDE 0100-530, which define requirements for protective measures against electric shock and overload. It also complies with construction regulations DIN VDE 0641-11 as well as international standards IEC/EN 60898-1 and IEC/EN 60947-2, which specify requirements for circuit protection switches and switching devices. Certification according to UL1077 makes the device suitable for use in the USA as well. Typical applications include residential and commercial buildings, where safe and reliable line protection is required.

Functions and Equipment in Detail

The device features a patented connection terminal that enables simple and secure contact. The connection is made via a pressure plate, ensuring a secure connection even with different conductor cross-sections. The cable entry opening is positioned above the phase bar entry opening, providing better visibility during wiring. The connection terminal allows direct connection of conductors with a cross-section up to 35 mm² (single-strand) and up to 25 mm² (multi-strand), with insulation integrated into the device. The mounting depth is 69 mm, and the device occupies a width of one module unit, making it suitable for use in standard installation switches.

Technology Explained Simply

The Z-characteristic of the circuit breaker means that the switch does not immediately trip at low overloads (e.g., 1.1 times the rated current), but only at higher loads or short circuits. This is particularly advantageous in installations where short-term current surges (e.g., with motors or electronic devices) occur, without the switch unnecessarily tripping. The rated switching capacity Icn is 6 kA at 230 V, describing the device's ability to safely interrupt a short-circuit current up to this level. Pollution degree 3 indicates that the device is suitable for environments with a risk of solid contamination, although no special requirements for insulation strength compared to clean environments apply.

Compatibility and Accessories

The device is designed for use in modular installation devices and can be combined with suitable accessories. Available accessories include CMS-101PS and CMS-102PS modular terminals, which enable secure and efficient connections in switchgear. These terminals are specifically developed for integration into the S 200 series and ensure a stable electrical connection. Combining the device with these modular terminals enables flexible and secure installation in enclosures and distributions.

Mounting and Installation

Mounting is performed in standard installation switches, with the device occupying a width of one module unit. The mounting depth of 69 mm must be considered during switchboard planning. The connection terminal allows direct connection of conductors without additional tools, with the pressure plate ensuring a secure connection. Installation is carried out indoors, as protection class IP20 does not provide protection against water or dust. Flush mounting is not intended; the device is exclusively suitable for surface mounting or enclosure mounting.

Operational Advantages

The circuit breaker S201-Z20 provides reliable protection with a clear tripping characteristic suitable for most applications in low-voltage installations. The patented connection terminal reduces installation time and increases connection safety. Certifications according to international standards enable worldwide use, and high quality assurance through triple testing before shipment ensures high reliability. The direct connection capability for conductors up to 35 mm² (single-strand) and 25 mm² (multi-strand) reduces the need for additional connection components.