# Hitachi Energy POLIM-R Neutral Grounding & Insulation Arrester

> surge-arrester - Silicone-housed surge arrester engineered for transformer neutral-point grounding, neutral-grounding resistor protection, and substation insulation coordination against lightning, switching impulses and earth-fault temporary overvoltages.

**Voltformer canonical:** https://voltformer.com/product/hitachi-energy-polim-r-neutral-grounding-surge-arrester - markdown version: https://voltformer.com/product/hitachi-energy-polim-r-neutral-grounding-surge-arrester.md

## Overview

- **Brand:** ABB / Hitachi Energy
- **Product family:** POLIM silicone-housed surge arresters
- **Category:** Grid Equipment & Power Quality / surge-arresters-and-insulation-coordination

## Manufacturer-stated technical envelope

- **System voltage:** 3.6–72.5 kV
- **Rated voltage:** 3–60 kV
- **Nominal discharge current:** 10 kA peak
- **Line discharge class:** 1 / 2
- **Mechanical strength (SSL):** 250 / 500 Nm
- **Housing:** Silicone polymer direct-molded housing with metal-oxide varistors for neutral and phase grounding protection

## Standards

- IEC 60099-4 Ed. 3.0
- IEEE C62.11
- IEC 60071-1

## Official sources

- https://www.hitachienergy.com/us/en/products-and-solutions/surge-arresters/medium-voltage-surge-arresters/indoor-and-outdoor-surge-arresters-polim-r

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Hitachi Energy POLIM-R medium-voltage silicone-housed surge arrester family data for transformer neutral grounding and insulation coordination. Continuous operating voltage Uc, rated voltage Ur, energy duty and grounding scheme must be verified for the specific project.

The stated values are family or catalogue-option limits. Select the exact order code and verify project-specific duties before procurement or release of an SLD design.