Pilz 828010 S1IM Current Monitoring Safety Relay
The Pilz 828010 S1IM is a precision current monitoring safety relay designed to monitor maximum current values in industrial electrical circuits. Part of Pilz's monitoring relay portfolio, the S1IM provides reliable overcurrent detection for motors, pumps, heating elements, and other electrical loads, helping to prevent equipment damage and ensure operational safety. The device combines compact design with flexible configuration options, making it suitable for panel mounting in control cabinets across manufacturing, process, and infrastructure applications.
Measuring Ranges and Configuration
The S1IM offers 12 selectable measuring ranges covering 0.01 A to 15 A, allowing the same device to be used across a wide variety of load currents. Range selection is performed via rotary switches on the front panel, eliminating the need for external current transformers for most applications. The relay monitors the true RMS value of the input current and can be set to trip when the current exceeds a user-defined threshold. An adjustable time delay prevents nuisance tripping during motor starting or other temporary inrush events. The device supports monitoring of frequencies from 0 to 400 Hz, making it compatible with both AC and DC current signals.
Technical Specifications
The Pilz 828010 operates from a 24 V DC supply voltage with a power consumption of just 1 W. The supply voltage type is DC, with a nominal voltage of 24 V. Dimensions are 87 mm in height, 22.5 mm in width, and 121 mm in depth, conforming to the slim profile standard for DIN rail mounting. The net weight is 125 g, and the housing material consists of PPO (UL 94 V0) for the lower and upper sections, with an ABS UL 94 V0 front plate. Terminal protection type is IP20, while the housing itself is rated IP40. Mechanical data indicates the mounting position is flexible, suitable for any orientation. Connection terminals are fixed screw terminals, accepting 24 to 10 AWG flexible conductors.
Output and Contact Data
The relay output contacts are constructed from AgCdO material with a 3.0 μm gold plating, ensuring reliable low-current switching even in dry circuit applications. Utilisation category according to EN 60947-4-1 is AC/DC1 stand., and AC15/DC13 according to EN 60947-5-1. Safety contacts at 240 V AC are rated for resistance switching. The pilot duty rating is B300 and R300. Maximum conductor cross-section for the relay outputs is sized appropriately for the current rating, with a maximum device circuit breaker specification limiting the protection device rating.
Approvals and Environmental Compliance
The Pilz 828010 carries multiple international approvals, including CE for the European market, UKCA for Great Britain, cULus Listed for North America, and CCC for China. Environmental compliance includes the RoHS directive (2011/65/EU and 2015/863/EU), with RoHS conformity verified. Due to the presence of lead as a SVHC substance, REACh compliance is declared with lead content exceeding 0.1% by weight (CAS No. 7439-92-1). A SCIP entry is available for the product. The WEEE classification group is 5 for devices with a feed size below 50 cm. Climatic suitability meets EN 60068-2-78 standards, with condensation not permitted. EMC conformity follows EN 60947-5-1 and EN 61000-6-2. Vibration testing meets EN 60068-2-6. Clearance and creepage distances conform to EN 60947-1 requirements.
Environmental Ratings and Installation
Operating ambient temperature range is from -15°C to 55°C, supporting installation in unheated industrial enclosures. The device should be mounted on a standard 35 mm DIN rail inside a control cabinet with at least IP54 protection. Adequate ventilation should be provided to maintain the ambient temperature within the specified range. The S1IM is not suitable for outdoor installation or environments with condensation, as moisture ingress would degrade the internal electronics over time.
Applications
Typical applications for the Pilz S1IM include monitoring of motor currents to detect overloads or phase loss, pump protection against dry running or blockage, heating element monitoring to detect open circuits, and general overcurrent protection for industrial loads. The relay can be integrated into safety circuits where overcurrent detection is required to initiate a safe shutdown. When combined with a suitable contactor, the S1IM can interrupt power to a load automatically when current exceeds the configured threshold, preventing thermal damage and fire hazards. The compact 22.5 mm width allows multiple units to be mounted side-by-side in high-density control panels, conserving valuable cabinet space.
Maintenance and Servicing
No routine calibration is required for the S1IM, as the measuring circuit is factory-calibrated and stable over time. The front-panel LEDs provide visual indication of power, trip status, and relay state for quick diagnostics. In the event of a fault, the relay output de-energizes and must be reset either manually (via the front button) or automatically (depending on configuration). Periodic inspection of terminal tightness and visual check for signs of overheating or contamination is recommended during scheduled plant shutdowns. The device contains no user-serviceable parts; internal repairs require factory service or authorized replacement.
