Siemens 3VA9877-0NA10

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Betriebsanleitung Operating Instructions Notice d'utilisation Instructivo Istruzioni operative

Instruções de Serviço İşletme kılavuzu Руководство по эксплуатации Instrukcja obsługi 使用说明

DANGER

Hazardous voltage. Will cause death or serious injury.

Turn off and lock out all power supplying this device

before working on this device.

NOTICE

Installation and maintenance must be carried

out by qualified personnel.

GEFAHR

DANGER

Gefährliche Spannung. Lebensgefahr oder schwere

Verletzungsgefahr. Bevor Arbeiten am Gerät durchge

führt werden, müssen alle Stromquellen ausgeschaltet

und mit einer Einschaltsicherung versehen werden.

Tension électrique dangereuse. Danger de mort ou

risque de blessures graves. Avant d'intervenir sur

l'appareil, couper toutes les sources de tension et les

consigner contre la refermeture.

HINWEIS NOTIFICATION

Installations- und Wartungsarbeiten sind von

qualifiziertem Personal durchzuführen.

L'installation et la maintenance doivent être

effectuées uniquement par des personnes

qualifiées.

PELIGRO

PERICOLO

Tensión peligrosa. Puede causar la muerte o lesiones

graves. Antes de trabajar en este dispositivo, desconecte

y bloquee todas las fuentes que lo alimentan eléctrica

mente.

Tensione pericolosa. Può causare la morte o lesioni

gravi. Prima di lavorare su questa apparecchiatura, disin

serire tutte le fonti di alimentazione elettrica dell'appa

recchiatura ed assicurarle contro la reinserzione.

NOTA NOTA

La instalación y el mantenimiento deben

corre a cargo de personal cualificado.

L'installazione e la manutenzione devono

essere eseguite da personale qualificato.

PERIGO

TEHLİKE

Tensão perigosa. Perigo de morte ou ferimentos gra

ves. Desligue e bloqueie todas as fontes de alimentação

antes de executar quaisquer trabalhos no aparelho.

Tehlikeli gerilim. Ölüm tehlikesi veya ağır yaralanma

tehlikesi mevcuttur. Cihazda çalışmalar yapılmadan

önce, tüm güç kaynakları kapatılmalı ve bir açma emni

yetiyle donatılmalıdır.

ATENÇÃO NOT

A instalação e manutenção têm de ser efetua

das por pessoal qualificado.

Montaj ve bakım işlemleri kalifiye personel

tarafından yapılmalıdır.

РУ

ОПАСНО

РL

ZAGROŻENIE

Опасное напряжение. Опасность для жизни или

телесных повреждений. До начала работы

выключите и заблокируйте все источники питания

этого устройства.

Niebezpieczne napięcie. Niebezpieczeństwo poważ

nych obrażeń lub utraty życia. Wyłączyć i zablokować

wszystkie źródła zasilania urządzenia przed rozpoczę

ciem pracy na urządzeniu.

ПРИМЕЧАНИЕ UWAGA

Установка и техническое обслуживание

должны производиться

квалифицированным персоналом.

Instalacja i konserwacja muszą być wy-

konywane przez wykwalifikowany personel.

Technical Support: Internet: https://www.siemens.com/support-request

Neutral Current Transformer

Neutralleiterwandler

Transformateur de courant de neutre

Transformador de corriente para neutro

Trasformatore di corrente per conduttore di neutro

Transformador de corrente neutro

Nötr Akım Trafosu

Трансформатор тока нейтрали

Neutralny przekładnik prądowy

中性电流互感器

3VA9077-0NA10 3VA9377-0NA10 3VA9877-0NA10 3VA9677-0NA11 UL 489

3VA9177-0NA10 3VA9677-0NA10 3VA9907-0NB10 IEC 60947-2

Last Update: 31 January 2024

Need help?

Do you have a question about the Siemens 3VA9877-0NA10 and is the answer not in the manual?

This document describes the Siemens Neutral Current Transformer, a device designed to measure neutral current in electrical systems. It is available in several variants, including 3VA9077-0NA10, 3VA9177-0NA10, 3VA9377-0NA10, 3VA9677-0NA10, 3VA9677-0NA11, 3VA9877-0NA10, and 3VA9907-0NB10. These transformers are designed for use with circuit breakers to provide ground fault protection and monitoring.

Function Description

The Neutral Current Transformer is a crucial component for detecting ground faults in electrical installations. It works by measuring the current flowing through the neutral conductor. In a healthy system, the sum of currents in the phase conductors and the neutral conductor should be zero. Any imbalance, particularly a current flowing through the neutral when it shouldn't, indicates a ground fault. The transformer provides a signal to a connected circuit breaker, which then trips to interrupt the power supply, preventing potential hazards like electric shock or fire.

The device supports various wiring configurations, including 4-wire ground fault residual mode, reverse connected 4-wire ground fault residual mode, and ground fault/ground return mode. These configurations allow for flexible integration into different electrical systems and ensure comprehensive ground fault detection.

Important Technical Specifications

The Neutral Current Transformer models have varying technical specifications to suit different applications:

3VA9077-0NA10, 3VA9177-0NA10, 3VA9377-0NA10:
- Pass-thru dimensions for cables: Ø 32 mm
- Max. cable dimensions: up to 185 mm² (up to 350 kcmil)
- Max. busbar dimensions: 1 x 30 x 10 mm (0.5 inch x 3 inch)
- Dimensions: 127 mm [5.00 in] height, 78.7 mm [3.1 in] width, 35 mm [1.38 in] depth. The opening for conductors is 43.5 mm [1.71 in] x 57.2 mm [2.25 in].
3VA9677-0NA10, 3VA9677-0NA11, 3VA9877-0NA10:
- Pass-thru dimensions for cables: 2 x Ø 34 mm
- Max. cable dimensions: up to 2 x 300 mm² (up to 2 x 600 kcmil)
- Max. busbar dimensions: 2 x 40 x 10 mm (0.5 inch x 3 inch)
- Dimensions: 104 mm [4.09 in] height, 104 mm [4.09 in] width, 38.0 mm [1.50 in] depth. The opening for conductors is 75.2 mm [2.96 in] x 35.6 mm [1.40 in].
- For the 3VA9677-0NA10 and 3VA9877-0NA10, there's also a variant with busbar dimensions of 2 x 100 x 10 mm (1.25 inch x 4 inch).
3VA9907-0NB10: This model includes a cable with a length of 3 m [9.8 ft].

The devices are designed to operate within an ambient temperature range suitable for industrial applications. They comply with UL 489 and IEC 60947-2 standards, ensuring safety and performance. The required torque for connections is 4.0 Nm [35 lb-in] for the main connections and 0.4 Nm [3.5 lb-in] for the sensor connections.

Usage Features

The Neutral Current Transformer is designed for easy integration and reliable operation.

Installation: Installation involves mounting the transformer and connecting the neutral conductor(s) through its opening. The connections to the circuit breaker are made using specified terminals. The manual provides detailed diagrams for connecting the sensor (S1, S2) to the neutral sensor input of the circuit breaker. The colors of the wires (S1 = pink/rosa, S2 = grey/grau) are consistent across multiple languages for clarity.
Safety: A critical warning is issued regarding hazardous voltage and the risk of electric shock or death. It emphasizes that only qualified personnel should install and maintain the device, and that power must be disconnected before any work is performed.
Compatibility: The device is designed to maintain electromagnetic compatibility (EMC) and should not cause interference with other equipment. For optimal EMC performance, the connection cable should not exceed 3 m [9.8 ft].
Flexibility: The various models and configurations allow the transformer to be used in a wide range of electrical systems, accommodating different cable and busbar sizes. The ability to handle multiple conductors (e.g., 2 x Ø 34 mm for 3VA9677-0NA10) provides versatility for complex installations.
Visual Indicators: While not explicitly detailed as an LED, the presence of sensor connections (S1, S2) implies that the device provides signals that can be interpreted by a connected circuit breaker or monitoring system to indicate the status of the neutral current.

Maintenance Features

Maintenance of the Neutral Current Transformer primarily focuses on ensuring proper installation and connection integrity.

Qualified Personnel: All installation, maintenance, and repair work must be performed by qualified personnel to ensure safety and proper functioning. This is a recurring theme throughout the manual, highlighting the importance of expertise.
Regular Checks: While not explicitly stated as a maintenance schedule, the nature of electrical components suggests that periodic checks of the connections and the physical integrity of the transformer are advisable. Loose connections can lead to poor performance or safety hazards.
Cleaning: The device should be kept clean to prevent dust or debris buildup that could affect its operation or insulation properties.
Troubleshooting: The manual implies that any issues with ground fault detection should lead to an inspection of the transformer and its connections, in conjunction with the circuit breaker.
Replacement: If the transformer is damaged or malfunctions, it should be replaced with an identical or equivalent Siemens part to maintain system integrity and safety. The modular design of the system, with separate transformers and circuit breakers, facilitates easier replacement of individual components.

The Siemens Neutral Current Transformer is a robust and essential device for ensuring electrical safety and compliance in various industrial and commercial applications by providing accurate and reliable ground fault detection.