# Crompton Protector Relay 253-PHDU 50 Hz 120V – Frequency Protection

The **Crompton Protector Relay 253-PHDU** is designed for 50 Hz 120V systems, providing essential frequency monitoring and protection for electrical systems. This relay ensures optimal performance and safeguards your equipment against frequency fluctuations.

Featuring robust construction, the **Protector Relay 253-PHDU** is engineered to energize the over relay and de-energize the under relay, maintaining stable operation. Ideal for industrial **automation** and **control systems**, it offers reliable protection with a 5A 250V Ac 50/60 Hz & 24V Dc contact rating.

-   **Frequency Monitoring**: Precisely monitors frequency to protect electrical systems.
-   **Over/Under Relay Control**: Energizes over relays and de-energizes under relays for stable operation.
-   **Durable Construction**: Made by **Crompton Instruments Ltd.** in the UK for long-lasting performance.
-   **Lightweight Design**: Easy to install, weighing only 520 grams.
-   **Reliable Protection**: Ensures equipment safety with a 5A 250V Ac 50/60 Hz & 24V Dc contact rating.

**Specifications:**

-   Frequency: 50 Hz
-   Voltage: 120V
-   Max Relay Contact Rating: 5A 250V Ac 50/60 Hz & 24V Dc
-   Type No: 253-PHDU
-   A.N.S.I. No.: 810/U

Trust the **Crompton 253-PHDU Protector Relay** for reliable frequency protection in your industrial applications. Ensure smooth operations and protect your valuable equipment. Contact us today for more information.

Also our company name is Ram Automations and also you can contact us on email info@ramautomations.com

## Details

- **Price:** 999.0 USD
- **Vendor:** Crompton
- **Type:** Industrial Automation > Relays > Protection Relays
- **Tags:** 253-PHDU, automation, crompton, electrical-systems, frequency-protection, protector-relay

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Used | 999.00 USD | In stock |

## Images

- Crompton Protector Relay 253-PHDU 50 Hz 120V – Frequency Protection-Ram Automations

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> Source: [Ram Automations](https://ramautomations.com/products/crompton-protector-relay-253-phdu)
> Updated: 2026-09-19