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7VE5120-4CA10-0A/FF

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Siemens 7VE5120-4CA10-0A/FF is a SIPROTEC 3 paralleling device for synchronism checking and controlled connection of electrical systems.
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Technical specifications for 7VE5120-4CA10-0A/FF

  • Manufacturer:
    Siemens
  • Part Number:
    7VE5120-4CA10-0A/FF
  • Product Family:
    Siemens SIPROTEC
  • Product Type:
    SIPROTEC 3 Paralleling Device
  • Stock:
    1
  • Measured AC range:
    100–125 V AC
  • Rated frequency:
    50/60 Hz
  • Auxiliary supply:
    60/110/125 V DC
  • Decision variables:
    Voltage, frequency and phase relationship
  • Output role:
    Controlled breaker close release
  • Breaker compensation:
    Configured operating-time allowance
  • Weight:
    18.872 lbs (8.56 kg)
  • Estimated shipping dimensions:
    22.5 x 23.4 x 26.7 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Applications Performance Monitoring Control

Features:

  • Evaluates synchronism conditions before breaker closure.
  • Supports 50 Hz and 60 Hz applications.
  • Uses a 60/110/125 V DC auxiliary-supply configuration.
The complete 7VE5120 code defines the paralleling hardware and option set used by the installed panel.

It permits closing only when the configured voltage, frequency and phase-angle conditions are satisfied.

VT circuits and breaker timing must be tested as one synchronization chain after replacement.

Availability is confirmed against the complete 7VE5120-4CA10-0A/FF identity, required condition, quantity and delivery destination at quotation.
Verified resources for Siemens 7VE5120-4CA10-0A/FF: Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Synchronize a generator before connection to a busbar.
  • Supervise closure between two energized power-system sections.
  • Retain legacy synchronism-check logic in a SIPROTEC 3 panel.
  • The closing decision uses configured limits for voltage, frequency and phase angle.
  • Breaker operating time is compensated in the synchronization sequence.
  • Stable measurements are required before a release is issued.
  • Front indications show measured conditions and close-release state.
  • Recorded events assist investigation of blocked or unsuccessful paralleling attempts.
  • Operators should compare displayed values with independent bus measurements during tests.
  • The output contact interfaces with the engineered breaker close circuit.
  • Live-bus and dead-bus permissions follow the approved switching philosophy.
  • External interlocks remain effective independently of the synchronism decision.
Description
7VE5120-4CA10-0A/FF is the SIPROTEC 3 7VE51 device used for synchronism supervision and paralleling duties. The marked configuration accepts 100–125 V AC measuring supply at 50/60 Hz and a 60/110/125 V DC auxiliary source. Its measuring inputs and closing logic work together as a permissive layer, reducing the risk of connecting two energized systems with unacceptable angular, voltage or frequency separation.

Before a breaker closes, the device evaluates the voltage, frequency and phase relationship of the two sides according to the configured synchronization window. Command logic and timing are coordinated with the breaker operating time and the plant's switching philosophy. The device is relevant to generator synchronization, bus-coupler operation and controlled network paralleling where a close command must be released within a precisely engineered window.

Changing the relay without confirming VT ratios, phase rotation, live/dead bus logic and close-circuit timing can defeat safe synchronization. Commissioning should include simulated slip-frequency tests and an independent check of the close command path. Before live synchronization, compare the indicated phase relationship with independent instruments and verify that breaker operating time, output contact logic and dead-bus conditions follow the switching procedure.
Alternative Names
7VE5120-4CA10-0A/FF 7VE5120 4CA10 0A FF 7VE51204CA100AFF Siemens 7VE5120 SIPROTEC 7VE51 Paralleling Device Siemens Synchronism Check Relay 7VE51 7VE5120 Paralleling Relay
Technical notes
Do not release the close circuit from 7VE5120-4CA10-0A/FF until VT phase sequence, dead-bus logic and breaker closing time have been proven.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which quantities must agree before Siemens 7VE5120-4CA10-0A/FF releases closing?
The configured checks evaluate the voltage difference, frequency difference and phase relationship across the breaker.
How does breaker operating time affect Siemens 7VE5120-4CA10-0A/FF?
The synchronization logic must account for the breaker delay so the contacts meet inside the permitted window.
What switching duty is intended for Siemens 7VE5120-4CA10-0A/FF?
It supports controlled paralleling or synchronism-check closure between two energized electrical sections.
How should an available Siemens 7VE5120-4CA10-0A/FF unit be specified to Apter Power?
Quote the full /FF code, supply and voltage ratings, case condition, quantity and requested delivery destination.
Why is a generic sync-check relay not a drop-in replacement for 7VE5120-4CA10-0A/FF?
VT scaling, live/dead logic, timing, contact assignments and panel terminals require an engineered mapping.
Which commissioning evidence should follow Siemens 7VE5120-4CA10-0A/FF installation?
Retain the phase-sequence check, simulated slip test, close-circuit proof and final setting record.