{"product_id":"bender-vme421h-d-1-150v-15-460hz-voltage-monitoring-relay-for-ac-dc-systems","title":"Bender VME421H-D-1 150V 15-460Hz Voltage Monitoring Relay for AC DC Systems","description":"\u003cdiv\u003e\u003cspan\u003eThe VME421H-D-1 is a multifunctional voltage and frequency monitoring relay from Bender, part of the LINETRAXX® series. It is designed for AC and DC systems to monitor undervoltage, overvoltage, underfrequency, overfrequency, and window discriminator functions. Voltage measurement uses the true RMS (AC+DC) method to ensure accuracy even in harmonic‑rich industrial environments.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eThe device requires no external auxiliary supply; its operating power is taken internally from the monitored system voltage. An integrated backup power supply ensures continued monitoring even during a complete power failure of the monitored system.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Rated system voltage (Uₙ): DC\/AC 9.6…150 V, 15…460 Hz\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Monitoring functions: Undervoltage, overvoltage, underfrequency, overfrequency, window discriminator\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Alarm relays: Two independent changeover contacts (K1, K2), AC 250 V \/ 6 A\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Measurement accuracy: Voltage ±1.5%, frequency ±0.2%\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Response time: Voltage ≤ 140 ms; frequency ≤ 335 ms\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Display: Multi‑function LCD display with backlight\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· LED indicators: Power On (green), Alarm 1 (yellow), Alarm 2 (yellow)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Adjustable time delays: Start‑up delay, response delay, release delay\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Operating temperature: –25 °C … +55 °C\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Mounting: DIN rail, width 36 mm (2 standard modules)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Connection types: Push‑wire terminals (order no. B73010003) or screw terminals (order no. B93010003)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Standards compliance: IEC 60664‑1, IEC 60664‑3, IEC 61010‑1\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· No external supply required – Powered directly by the monitored system voltage\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Integrated backup power – Internal energy storage ensures continued monitoring even during supply failure\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· True RMS measurement (AC+DC) – Accurate voltage measurement with harmonic distortion and non‑sinusoidal waveforms\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Multifunctional monitoring – Undervoltage, overvoltage, underfrequency, overfrequency, window discriminator\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Two independent alarm relays – Configurable for different alarm conditions with N.O.\/N.C. operation\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Adjustable time delays – Start‑up delay, response delay, release delay to prevent nuisance tripping\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Adjustable hysteresis – Prevents relay chatter due to voltage fluctuations\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Preset function – Automatically assigns basic parameters on first power‑on, simplifying commissioning\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Digital measured value display – Continuous real‑time display on LC display\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Measured value memory – Stores the value that triggered the alarm relay for fault diagnosis\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Continuous self‑monitoring – Automatic self‑test ensures operational reliability\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Password protection – Sealable transparent cover prevents unauthorised parameter changes\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eTypical Applications\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Voltage and frequency monitoring of single‑phase machines and electrical installations\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Earth fault monitoring in medium‑voltage systems via voltage transformers\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Monitoring of battery systems\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Switching machinery and equipment at specific voltage thresholds\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Voltage protection for voltage‑sensitive electrical equipment\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e· Monitoring of emergency and standby generators\u003c\/span\u003e\u003c\/div\u003e","brand":"Bender","offers":[{"title":"Default Title","offer_id":44147210616920,"sku":null,"price":772.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0580\/2799\/9320\/files\/VME421H-D-1.jpg?v=1779854818","url":"https:\/\/gexufein.com\/products\/bender-vme421h-d-1-150v-15-460hz-voltage-monitoring-relay-for-ac-dc-systems","provider":"Gexufein Automation","version":"1.0","type":"link"}