ABB 1SVR740850R0300 Liquid level monitoring relay - CE/UKCA
Part Number: 1SVR740850R0300
Quick Summary
Liquid level monitoring relay CM-ENS.31P from ABB provides reliable conductive-liquid level sensing for pumps and tanks. Many customers struggle with dry-run damage, overflow events, and manual monitoring that invites errors. The device is CE and UKCA certified and carries UL/CSA approvals, with an IP50 housing and robust electrical/durability ratings to withstand harsh environments. It supports a wide supply window of 24–240 V AC/DC, 2 SPDT contacts, and adjustable sensitivity and timing, enabling precise control of pumping cycles. With Easy Connect push-in terminals, a sealable cover, and DIN-rail mounting, installation is fast and tamper-resistant. In practice, this translates to reduced maintenance, improved process reliability, and lower operating costs in continuous production lines.
Product Information
Extended Description
1SVR740850R0300 ABB: The CM-ENS.31P belongs to the CM liquid level monitoring relay range. It operates with a rated control supply voltage of 24 - 240 V AC/DC and has a 2 c/o (SPDT) output with contacts rated at 250 V / 4 A. It monitors liquid levels of conductive fluids and protects pumps against dry running or tanks against overflow. The working principle as well as the sensitivity can be selected via front-face potentiometers. Furthermore, an ON-delay or an OFF-delay can be adjusted within a range of 0.1 to 10 s. Several electrodes and a sealable transparent cover for protection against unauthorized changes are available as accessory. The device offers maintenance free Easy Connect Technology with push-in terminals.
EAN
4013614502859
Minimum Order Quantity
1 piece
Customs Tariff Number
85364900
Data Sheet, Technical Information
Data sheet - Liquid level monitoring relays CM-ENS.31
Instructions and Manuals
Instruction sheet - CM-ENS.xxx Liquid level monitoring relays | Installation instructions - CM-ENS.xxx Liquid level monitoring relays
CAD Dimensional Drawing
Information - 2D and 3D files for CAD systems
Product Net Width
22.5 mm
Product Net Height
85.6 mm
Product Net Depth / Length
103.7 mm
Product Net Weight
0.134 kg
Function
Filling or draining monitoring
Number of Electrodes
3
Measuring Range
0 | 1 ... 1000 kΩ
Time Range
0 s or 0.1 ... 30 s tripping delay (ON or OFF)
Rated Control Supply Voltage (Us)
24 ... 240 V AC/DC
Rated Frequency (f)
Supply Circuit 50/60 Hz
Output
2 c/o (SPDT) contacts
Terminal Type
Screwless Terminals
Rated Operational Current AC-12 (Ie)
(230 V) 4 A
Rated Operational Current AC-15 (Ie)
(230 V) 3 A
Rated Operational Current DC-12 (Ie)
(24 V) 4 A
Rated Operational Current DC-13 (Ie)
(24 V) 2 A
Minimum Switching Capacity
12 V | 10 mA
Rated Impulse Withstand Voltage (Uimp)
Measuring Circuit / Output Circuit 4 kV | Output Circuit 1 / Output Circuit 2 4 kV | Supply Circuit / Measuring Circuit 4 kV | Supply Circuit / Output Circuit 4 kV
Rated Insulation Voltage (Ui)
Measuring Circuit / Output Circuit 300 V | Output Circuit 1 / Output Circuit 2 300 V | Supply Circuit / Measuring Circuit 300 V | Supply Circuit / Output Circuit 300 V
Degree of Protection
Housing IP50 | Terminals IP20
Overvoltage Category
III
Pollution Degree
3
Short-Circuit Protective Devices
Output Circuit NC - F Type Fuses 6 A | Output Circuit NO - F Type Fuses 10 A
Electrical Durability
AC-12 100000 cycle
Mechanical Durability
Nr. Operations 1000000 cycle
Connecting Capacity
Flexible with Ferrule 2x 0.5 ... 1.5 mm² | Flexible with Insulated Ferrule 2x 0.5 ... 1.5 mm² | Flexible 2x 0.5 ... 1.5 mm² | Rigid 2x 0.5 ... 1.5 mm²
Tightening Torque
Control Circuit 0.9 N·m | Main Circuit 1 N·m
Wire Stripping Length
8 mm | Main Circuit 10 mm
Mounting Position
1 ... 5 | 1 ... 6
Mounting on DIN Rail
TH35-15 (35 x 15 mm Mounting Rail) acc. to IEC 60715 | TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715
Standards
CAN/CSA C22.2 No.14 | IEC/EN 63000 | IEC/EN 60255-27 | IEC/EN 61000-6-2 | IEC/EN 61000-6-3 | UL 508
Maximum Operating Voltage UL/CSA
Output Circuit 300 V AC
Contact Rating UL/CSA
B300
Connecting Capacity UL/CSA
Flexible 2x 18-16 AWG | Rigid 2x 20-16 AWG
Pilot Duty UL/CSA
B300
Ambient Air Temperature
Operation -25 ... +60 °C | Storage -40 ... +85 °C
Maximum Operating Altitude Permissible
Without Derating 2000 m
Conflict Minerals Reporting Template (CMRT)
CMRT - Conflict Minerals Reporting Template
REACH Declaration
REACh Info for Electronic Relays and Controls
RoHS Information
RoHS Declaration of conformity for Electronic Relays and Controls
RoHS Status
Following EU Directive 2011/65/EU and Amendment 2015/863 July 22, 2019
Toxic Substances Control Act - TSCA
Toxic Substances Control Act (TSCA) declaration for Electronic Relays and Controls
CQC Certificate
CQC Certificate, Liquid Level Monitoring Relays, CM-ENS.xxx, Made in Germany
cULus Certificate
cULus508_20150627-E140448
Declaration of Conformity - CCC
CCC Declaration of Conformity, Liquid Level Monitoring Relays, CM-ENS.xxx, Made in Germany
Declaration of Conformity - CE
EU Declaration of Conformity - CM-ENS.xxx Liquid level monitoring relay
Declaration of Conformity - UKCA
UK Declaration of Conformity - CM-ENS.xxx Liquid level monitoring relay
DNV GL Certificate
DNV GL Certificate - CM-ENS.xxx Liquid level monitoring relays
Package Level 1 Units
box 1 piece
Package Level 1 Width
97 mm
Package Level 1 Depth / Length
30 mm
Package Level 1 Height
109 mm
Package Level 1 Gross Weight
0.159 kg
Package Level 1 EAN
4013614502859
Object Classification Code
B
ETIM 7
EC001447 - (Fill) level monitoring relay
ETIM 8
EC001447 - (Fill) level monitoring relay
ETIM 9
EC001447 - (Fill) level monitoring relay
eClass
V11.0 : 27371813
UNSPSC
39122331
E-Number (Finland)
2712573
E-Number (Norway)
4189440
Wide supply voltage compatibility of 24-240 V AC/DC reduces spare parts and enables a single device across a global installation footprint, lowering procurement complexity and stock levels while speeding commissioning in new lines. The CM-ENS.31P provides two SPDT outputs, allowing one channel to drive a pump and the other to trigger an alarm, delivering flexible control for both equipment protection and process monitoring in demanding environments. Adjustable sensitivity of 0.1-1000 kΩ plus three sensing electrodes lets you tailor the trip point to liquid conductivity, improving accuracy and reducing false trips in dirty tanks common in chemical processing and cooling systems. An ON/OFF delay of 0.1-30 s minimizes nuisance trips, protecting pumps from short surges and extending service life. Features such as sealable cover, push-in terminals, and DIN-rail mounting simplify installation and tamper resistance, while IP50 housing provides rugged outdoor and indoor operation. Durability specs include AC-12 rated operation for up to 100,000 cycles and 1,000,000 mechanical cycles, ensuring long service life across multiple sites. Certifications including CAN/CSA, CE, UL/CSA, and UKCA support global deployment and compliance with industry standards.
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FAQs
Yes. CM-ENS.31P mounts on standard DIN rails TH35-15 or TH35-7.5 and uses screwless push-in terminals for quick wiring. It supports a 24–240 V AC/DC supply and provides two SPDT outputs, simplifying integration with existing controllers. The unit also includes three sensing electrodes and a sealable cover to prevent tampering, making retrofit and field updates straightforward.
Key performance specs include a 24–240 V AC/DC supply, two SPDT outputs rated up to 4 A at 230 V, and a measurement range of 0 to 1000 kΩ with adjustable sensitivity. The device operates at 50/60 Hz and supports ON/OFF delays from 0.1 to 30 seconds, enabling precise, reliable level control in challenging industrial environments.
Yes. CM-ENS.31P is designed for conductive liquids and provides dry-run protection and overflow control through accurate level sensing. With two SPDT outputs, it can drive a pump and trigger a secondary alarm or interlock. The three-electrode arrangement and configurable delays allow tailoring to liquid properties, reducing pump wear and preventing tank overflows in real-world installations.
The device carries CE, UKCA, UL/CSA, CCC, and DNV GL certificates, along with CAN/CSA C22.2 compliance and IEC 61000 series safety standards. These certifications ensure global electrical safety and interoperability, supporting market access and regulatory compliance in regulated environments. The IP50 housing and insulation standards further bolster safe operation in industrial settings.
The ROI comes from reduced maintenance and faster commissioning. Easy Connect push-in terminals minimize wiring errors and installation time, while long mechanical and electrical durability (1,000,000 and 100,000 cycles respectively) reduce replacement and service costs. A wide input range and dual outputs also lower spare-part counts, cutting overall operating expenses across multiple tanks or production lines.