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The Siemens 3MU7110-0JA0 thermal overload relay is engineered for reliable protection in industrial control systems where safeguarding motors and circuits against sustained overcurrent is critical. As part of the SINOVA 3MU7 family, this unit accommodates an adjustable current range of 2.5–4 A with a Class 10 trip characteristic, making it suitable for a broad spectrum of applications involving three-phase motors and electrical loads. Its design allows straightforward mounting directly onto 3MT7 contactors (sizes 0, 1, and 2), with screw-type terminals for both the main and auxiliary circuits ensuring secure wiring. Built to withstand demanding environments, it offers rated insulation up to 690 V AC, good shock resistance per IEC standards, and operational stability across a wide ambient temperature range. The relay includes both normally closed and normally open auxiliary contacts, indicating trip status while facilitating integration with control circuits, and supports either manual or automatic reset to match system requirements.
Product Name : Siemens 3MU7110-0JA0 Thermal Overload Relay
Product Family : SINOVA 3MU7 thermal overload relays
Article Number : 3MU7110-0JA0
Current Range : 2.5 – 4 A (adjustable trip range)
Trip Class : Class 10
Contactor Compatibility : 3MT7 Size 0, 1, 2
Main Circuit Connection: Screw terminals
Auxiliary Circuit Connection : Screw terminals
Reset Type : Manual and automatic reset
Rated Operational Voltage : Up to 690 V AC
Operating Frequency : 50 / 60 Hz
Insulation Voltage : (Pollution Degree 3) 690 V
Surge Withstand Voltage : (Uimp) 6 kV
Auxiliary Contacts Includes auxiliary contacts (typically 1 NC + 1 NO)
Power Loss (at rated current) ~10.8 W total (~3.6 W per pole)
Max Installation Altitude 2 000 m
Ambient Temperature (Operation) : -5 °C to +55 °C
Ambient Temperature (Storage) : -25 °C to +70 °C
Relative Humidity (Operation) :10 % – 95 %
Shock Resistance : 15 g, 11 ms (IEC 60068-2-27)
Reference Standard : IEC 60947-4-1 (for thermal overloads)
Net Weight : ~0.15 kg
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