Compared with the traditional integrated Z/T series limit switches, Schmersal PS series modular limit switches adopt an innovative building-block modular structure as a new generation of position monitoring components designed for modern intelligent manufacturing. Compliant with EN ISO 14119, these Type 1 position limit switches can be freely assembled from base switch bodies, interchangeable actuator heads, contact modules and wiring assemblies. They are deployed for travel limitation, home position referencing, position feedback of moving components and status monitoring of protective mechanisms. Balancing standard position detection and functional safety requirements, they can be used as complete units or configured with separate modular components, perfectly matching the standardized design requirements of new automated machinery.
Schmersal’s new modular limit switches centre on the PS product family, divided into three main lines: compact PS116, universal PS2xx and heavy-duty PS3xx. Below are 20 mainstream commonly used models:
PS116-Z11-L
PS116-02ZG-R
PS215-11Z-M20
PS216-12ZK
PS226-02Z
PS226-11Z-ST
PS315-11Z-R
PS316-02ZVK
PS316-12Z-M16
PS116-Z12-L200
PS215-02ZK-ST
PS326-11Z
PS326-02Z-R
PS116-01ZG-S
PS226-12Z-M20
PS315-02Z-ST
PS216-11ZK-R
PS116-12ZG-L
PS326-12ZVK
PS215-12Z-ST2
These switches serve a wide range of applications: automated production lines, CNC machine tools and machining centres, robot peripheral equipment, lithium new energy equipment, injection moulding and rubber & plastics machinery, automated packaging equipment, elevator lifting systems, logistics sorting and conveyor lines, construction machinery, port lifting equipment, printing machinery, wood processing equipment, food processing lines, rail transit equipment and hydraulic stamping machinery. They are ideal for standard matching on new machinery, modular equipment design, as well as upgrading and retrofitting legacy machines.
Compared with conventional integrated limit switches, PS series modular limit switches feature five remarkable advantages:
First, building-block modular assembly enables flexible selection and reduces spare part varieties. Unified base switch bodies support dozens of interchangeable actuators including roller levers, plungers and bidirectional rollers. Actuator heads can be adjusted in 45° increments, and a single base fits multiple triggering modes. This significantly cuts the number of spare part models and lowers inventory costs.
Second, built-in positive-opening safety contacts deliver superior safety levels. Equipped with positive-break NC contacts, the switches achieve PLd safety level when combined with safety relays and satisfy CE machinery certification requirements. Both snap-action and slow-action contact modes are available to accommodate high-precision positioning and heavy-duty limiting applications.
Third, excellent protection and environmental adaptability. Standard variants reach IP66/IP67 protection class. Housings are available in glass-fibre reinforced plastic or metal versions to resist dust, coolant and oil contamination. Supporting a wide operating temperature range and strong vibration & shock resistance, they maintain stable long-term operation.
Fourth, diversified wiring options facilitate seamless integration. Screw terminals, spring-cage terminals and M12 connectors are optional. Selected models support bus extension and can connect to AS-i Safety at Work systems, simplifying control cabinet wiring and enabling networking for smart production lines.
Fifth, convenient installation, commissioning and lower maintenance costs. Standard mounting dimensions are compatible with mainstream profile frames. Actuator heads can be replaced on-site without removing the entire switch body, saving time during troubleshooting. Full sets of international certifications are available to support machinery export.
Against the trend of standardised and modular intelligent manufacturing, traditional integrated limit switches suffer from limited configuration options and excessive spare part varieties. With highly flexible assembly options, reliable safety performance and user-friendly maintenance, Schmersal PS series modular limit switches become the preferred position detection components for developing new automated equipment. Meeting both general positioning and safety monitoring demands, they deliver efficient and flexible travel limiting solutions for machinery across all industries.
Related Modular Limit Switches
Browse the complete Schmersal Modular Limit Switches range. Representative models available through Glorient:
Modular limit switches with positive-opening contacts are the building blocks of Category 3/4 circuits. Read SIL vs PL Explained: Performance Levels, Safety Categories and Component Selection for the full framework.
Frequently Asked Questions
What is a modular limit switch?
A modular limit switch, such as the Schmersal PS series, has interchangeable actuator heads, switch elements and housings. You configure the switch to the application by combining standard modules rather than stocking many fixed variants.
What is the advantage of a modular design?
Reduced spare-parts inventory, flexible configuration and fast changeover. One base switch can serve multiple applications simply by swapping the actuator head or contact element, which lowers maintenance cost and downtime.
What standards do the PS series switches comply with?
They comply with EN 60947-5-1 and IEC 60947-5-1, with optional positive-opening contacts available for safety-related functions.