Rittal 7859420 PSM Measuring Module - IP20
Part Number: 7859420
Manufacturer
Rittal
Part number
7859420
Category
Alt Part Number
DK 7859.420
Quick Summary
Rittal 7859420 PSM measuring module provides accurate energy measurement and switching for modular power distribution in control cabinets. For engineers expanding busbar systems, visibility into load and device safety can become a bottleneck during integration. It complies with the Low Voltage Directive 2014/35/EU and delivers IP 20 protection along with EN 50 600-2-2 safety standards, ensuring reliable performance in industrial environments. By combining local measurement with CAN bus connectivity and a clear backlit display, it offers actionable energy data and enables streamlined commissioning, translating to reduced downtime and improved compliance across the factory floor.
Product Information
Extended Description
7859420 Rittal: DK PSM measuring module, for modular PSM power distribution. Occupies 2 slots in the busbar. Output: IEC 60 320 4 x C19, 2 x C13, input: 207 V – 250 V, 16 A, (max. 3680 W)
Article number
DK 7859.420
Product description
A power meter and switching functions for the output slots can be added to any PSM busbar with these PSM plug-in modules. The modules are also suitable for upgrading existing PSM installations if it becomes necessary to record the power data or add a switching option for the connected equipment. There are three variants available with different socket types. In the PSM busbar, the PSM modules occupy two module slots each. Measurements are displayed locally on a backlit LC display. For quick checks, the colour changes to red if current and power limits are exceeded.
Benefits
Simple, shock-hazard-protected, plug & play installation with the system operational
Function principle
Measurement of power consumption per module
Material
Socket inserts: Plastic (PA6 GF 30 V1) | Section: Aluminium, anodised
Supply includes
PSM measurement modules with CAN bus | CAN bus connection cable, 1 m
Distribution output per module
3,680 W
Switching load per relay
4,000 VA
Length
500 mm
Contamination level
2
Interface bus system
2 x CAN bus interfaces to CMC III (max. 16 on PU/4 on PU Compact)
Qty.
1
Relay version
Dual coil, bistable
Rated operating voltage
18 V (DC) - 24 V (DC), power supply via CMC III system
Input voltage
230 V AC
Tolerance of input voltage
± 10 %
Rated current
16 A
Required number of module slots
2
No. of participating PU compact (max.)
4
No. of participating PU (max.)
8
Directives
Low Voltage Directive 2014/35/EU
IP protection category to IEC 60 529
IP 20
Monitoring
Alarm management via CMC III (e.g. e-mail or text message)
Standards
EN 50 600-2-2
Measurement functions, description
Voltage V, current A, frequency Hz
Protocols
Network functionality (only in conjunction with CMC III system): IPv4, IPv6, SNMPv3, Modbus/TCP, OPC-UA
Dimensions
Width: 53 mm | Depth: 45 mm | Length: 500 mm
Maximum operating altitude
2,000 m
Operating temperature range
5 °C...60 °C
Ambient humidity (non-condensing)
90 %
Sockets
2 x C13 / 4 x C19
Relative humidity (non-condensing)
10 %
Storage temperature range
-20 °C...70 °C
Packs of
1 pc(s).
Weight/pack
0.992 kg
PCF per pack (cradle-to-gate)
3.8 kg CO2 eq (Cat B)
Note on PCF category
Category B: PCF value (cradle-to-gate) based on the product weight, approximately calculated and self-declared
Customs tariff number
85369001
EAN
4028177801851
ETIM 9
EC000330
ECLASS 8.0
27371306
Product description
DK PSM measuring module, for modular PSM power distribution. Occupies 2 slots in the busbar. Output: IEC 60 320 4 x C19, 2 x C13, input: 207 V – 250 V, 16 A, (max. 3680 W)
Feature: The module occupies two slots in the PSM busbar, enabling plug-and-play installation that minimizes wiring and commissioning time. Business Impact: Faster project ramp-up and reduced现场 labor costs. Application: Ideal for retrofitting existing PSM installations or expanding new modular power distribution in control cabinets. Feature: Outputs configured as 4 x C19 and 2 x C13 with a 230 V AC input, 16 A rating, and a maximum 3,680 W per module. Business Impact: Safe, scalable distribution of critical loads with clear headroom for peak demand. Application: Supports mixed equipment loading in automation panels while preserving space and efficiency. Feature: Measurements cover voltage, current, and frequency with a readable backlit LC display that highlights limit breaches in red. Business Impact: Immediate visibility for operators and reliable energy monitoring for compliance reporting. Application: Real-time data drives proactive maintenance and energy management strategies. Feature: CAN bus interfaces to CMC III and compatibility with IPv4/IPv6, SNMPv3, Modbus/TCP, and OPC-UA. Business Impact: Seamless integration with SCADA/MES ecosystems and centralized alarm management. Application: Enables remote monitoring, alarming, and data logging across multiple PU units. Feature: Robust build with IP 20 protection, 5 °C to 60 °C operating range, and extended storage conditions. Business Impact: Durable performance in cabinet environments with predictable uptime. Application: Suitable for equipment racks in manufacturing and process automation where reliability is critical.
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FAQs
The 7859420 PSM module is designed to occupy two busbar slots and install as a plug-in unit. It connects to the CAN bus for system-wide monitoring and draws supply via the CMC III infrastructure. With 230 V AC input and a 16 A rating, it integrates quickly without rewiring the existing layout, enabling rapid upgrades to measurement and switching functionality while preserving safety and compliance.
Each module measures voltage, current, and frequency, with results shown on a backlit LC display for clear local visibility. The display highlights exceedances with a red alert, providing immediate feedback to operators. This information can be logged or pushed to remote systems via Modbus/TCP, OPC-UA, or SNMPv3 when connected to a CMC III network.
Yes. The module supports up to 4 PU compact units and up to 8 PU modules in a single system, enabling scalable deployment across distributed control panels. It occupies two module slots in the busbar, making installation straightforward in larger assemblies while maintaining modular expandability for future power monitoring needs.
The DK 7859.420 module complies with the Low Voltage Directive 2014/35/EU (CE) and EN 50 600-2-2 safety standards and features IP 20 protection. These certifications assure safe operation within cabinet environments and alignment with European electrical safety requirements, supporting regulatory compliance for industrial automation projects.
By delivering per-module energy data and alarm management, the 7859420 reduces unplanned downtime and helps identify energy waste at the source. Its plug-and-play installation shortens commissioning time, while remote monitoring capabilities from CMC III enable proactive maintenance and performance optimization across multiple panels, delivering measurable cost savings and improved asset utilization over the system lifecycle.