POLYPHASER IS-B50LU-C0-ME Uhf Bulkhead Coaxial Rf Surge Protector F/m 1.5-400

( Brand: Polyphaser ), ( Manufacturer Part Number: IS-B50LU-C0-ME ), ( Compatible Brand: Universal ), ( Type: Grounding ), ( Connector B: Uhf Male ), ( Connector A: Uhf Female ), ( Features: Compact And Lightweight Design )

Review POLYPHASER Uhf F/m Bulkhead Coaxial Rf Surge Protector 1.5-400

The **PolyPhaser IS-B50LU-C0-ME UHF/FM Bulkhead Coaxial RF Surge Protector (1.5 400 MHz)** is a high-performance, ruggedized surge protection device meticulously engineered to safeguard sensitive RF (radio frequency) equipment and transmission lines from damaging voltage spikes, transients, and electromagnetic interference (EMI). Designed for demanding outdoor and industrial applications, this bulkhead-mounted coaxial surge protector features a robust, weather-resistant construction that ensures reliable operation in harsh environments, including exposure to moisture, dust, and temperature fluctuations. Its compact yet durable metal enclosure is built to withstand physical stress, making it ideal for mounting in telecommunication towers, broadcast facilities, amateur radio setups, and other critical RF infrastructure where signal integrity and equipment longevity are paramount.

The IS-B50LU-C0-ME operates within a broad frequency range of **1.5 MHz to 400 MHz**, covering UHF (Ultra High Frequency) and FM (Frequency Modulation) bands with minimal insertion loss, ensuring that signal quality remains uncompromised while protecting against surges exceeding ** 1,500 volts** (peak) in a bidirectional configuration. Its advanced **gas discharge tube (GDT) technology** provides fast response times typically under **1 nanosecond** to clamp excessive voltage spikes, diverting them safely to ground while maintaining an open circuit under normal operating conditions. This precision-engineered protection mechanism prevents backfeed and ensures that only clean, stable RF signals pass through, thereby extending the lifespan of connected equipment such as amplifiers, antennas, and receivers.

For ease of installation and integration, the IS-B50LU-C0-ME is equipped with a **male N-type female (N-F) bulkhead connector** on the front panel, allowing for straightforward mounting in standard coaxial bulkhead panels. The unit s **low-pass filtering** design further enhances its ability to suppress high-frequency noise and harmonics, making it particularly suitable for applications where signal purity is critical. Additionally, its **mechanical keying** ensures proper alignment and prevents accidental misconnection, reducing the risk of damage during installation or maintenance. The surge protector s **thermal management** features, including heat-resistant materials and efficient heat dissipation, allow for continuous operation without performance degradation, even in high-power RF environments.

Beyond its technical specifications, the IS-B50LU-C0-ME exemplifies reliability and versatility, making it a trusted choice for professionals in broadcasting, amateur radio, public safety communications, and other RF-dependent industries. Whether deployed in a remote field station, a broadcast tower, or a critical infrastructure network, this surge protector delivers uncompromising protection while maintaining signal integrity across its entire operational bandwidth. Its combination of **durability, precision, and ease of use** ensures that it stands as a cornerstone of RF system protection, mitigating risks associated with electrical surges and ensuring seamless, uninterrupted performance for years to come.

The **PolyPhaser IS-B50LU-C0-ME UHF/FM Bulkhead Coaxial RF Surge Protector (1.5 400 MHz)** is a specialized surge protection device designed for RF (radio frequency) applications, particularly in broadcast, amateur radio, and other low-power UHF/FM systems. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Effective Surge Protection**

The device is engineered to clamp and divert transient voltage spikes (surges) away from sensitive RF equipment, preventing damage from lightning strikes, power line surges, or electrostatic discharge (ESD). This is critical in environments where RF systems are exposed to outdoor conditions or unreliable power sources.

2. **Wide Frequency Range (1.5 400 MHz)**

It covers UHF and FM bands, making it suitable for applications like amateur radio (e.g., 2-meter FM), public safety communications, and low-power broadcast systems. This versatility ensures compatibility with a range of RF devices without requiring additional filters.

3. **Bulkhead Mounting**

The bulkhead design allows for easy installation in enclosures, racks, or panels, which is ideal for professional setups where space and organization are priorities. This feature reduces clutter and improves cable management.

4. **Low Insertion Loss**

The device is designed to minimize signal attenuation, ensuring that the RF signal passes through with minimal degradation. This is important for maintaining signal integrity in critical applications where power and clarity are essential.

5. **Durable Construction**

PolyPhaser products are generally built to withstand harsh environments, including temperature fluctuations and humidity. The metal housing and robust components suggest reliability in both indoor and outdoor installations.

6. **Easy Installation**

The bulkhead mount and coaxial connectors (likely F-type or similar) make installation straightforward for technicians with basic tools. No complex wiring or specialized expertise is typically required.

7. **Compatibility with Coaxial Cables**

It is designed to work seamlessly with standard coaxial cables (e.g., RG-58, LMR-400), which are common in RF applications. This ensures broad compatibility with existing infrastructure.

8. **Cost-Effective Protection**

For low-to-moderate power RF systems, this surge protector offers a balance between cost and protection. It may be more affordable than high-end commercial-grade surge protectors designed for professional broadcast or military applications.

---

### **Cons**

1. **Limited to Low-Power Applications**

While effective for UHF/FM (up to 400 MHz), this surge protector is not designed for high-power RF systems (e.g., HF bands, high-wattage transmitters, or commercial broadcast towers). For such applications, more robust or specialized surge protectors (e.g., those rated for higher voltage or current) would be necessary.

2. **No Built-In Lightning Arrestor for Outdoor Use**

While it protects against transient surges, it may not fully isolate the system from direct lightning strikes or extreme electromagnetic interference (EMI) in outdoor environments. Additional grounding and shielding may be required for outdoor installations.

3. **Single-Port Design**

The device appears to have a single input/output port, which limits flexibility in systems requiring multiple surge-protected connections. For larger setups, multiple units or a surge protector with multiple ports may be needed.

4. **Potential for False Triggers**

Some surge protectors can be sensitive to normal voltage fluctuations, leading to unnecessary resets or tripping. While PolyPhaser devices are generally reliable, there is a slight risk of the protector activating during transient events that are not actual surges (e.g., power line noise).

5. **Limited Warranty or Support Information**

The specific warranty or support details for this model are not provided in the product name. Depending on the vendor, warranty coverage for surge protectors may be limited (e.g., 1 2 years), and replacement parts may not be readily available for older models.

6. **Not Ideal for High-Voltage Systems**

The 1.5 400 MHz range and bulkhead design suggest it is not suited for systems with high-voltage inputs (e.g., those requiring surge protectors rated for 50V or higher). For such systems, a different model or additional protection (e.g., varistors or gas discharge tubes) would be required.

7. **Dependence on Proper Grounding**

Like all surge protectors, its effectiveness relies on a properly grounded system. If the grounding in the installation is inadequate, the protector may not function as intended, leaving equipment vulnerable to surges.

---

### **Conclusion**

The **PolyPhaser IS-B50LU-C0-ME** is a practical and effective surge protector for **low-power UHF/FM RF applications**, particularly in amateur radio, small broadcast systems, or protected outdoor installations. Its bulkhead design, wide frequency range, and low insertion loss make it a solid choice for technicians looking to safeguard sensitive RF equipment without significant signal degradation. However, it is not suitable for high-power or high-voltage systems, and its effectiveness depends on proper installation and grounding.

For users operating within its specified range (1.5 400 MHz) and in environments with moderate surge risks, this surge protector offers a reliable and cost-effective solution. Those requiring protection for higher power or more extreme conditions should consider complementary surge protection devices or models designed for those specific applications.

---

### **Recommendation**

- You are using **UHF/FM RF equipment** (e.g., 2-meter FM radios, low-power repeaters, or small broadcast systems).

- Your system operates at **low power levels** and is not exposed to extreme environmental hazards (e.g., direct lightning strikes).

- You need a **compact, bulkhead-mounted solution** for easy installation in enclosures or racks.

- You prioritize **minimal signal loss** and want a device that integrates well with standard coaxial cables.

- Your RF system operates at **high power levels** (e.g., HF bands, high-wattage transmitters).

- You are installing it in a **high-risk outdoor environment** without additional lightning protection (e.g., a lightning arrestor or surge suppressor rated for higher voltages).

- You require **multiple surge-protected connections** in a single setup (you may need multiple units or a multi-port protector).

- You are unsure about the **grounding quality** of your installation, as improper grounding can render the protector ineffective.

- You need protection for **broader frequency ranges** (e.g., HF or VHF). In that case, look for surge protectors with wider bandwidth or dedicated HF surge arrestors.

- You require **higher surge suppression ratings** (e.g., for commercial broadcast or military applications). Models like the **PolyPhaser IS-1000 series** or other commercial-grade protectors may be more appropriate.

- You want **built-in monitoring or indicator lights** to confirm the protector is active. Some higher-end models include LEDs or status indicators.

For most **amateur radio operators, small repeaters, or protected FM systems**, the **PolyPhaser IS-B50LU-C0-ME** is a **reliable and practical choice**. Pair it with proper grounding and, if necessary, additional surge suppression for outdoor setups to maximize its effectiveness.

Details:

New in box Polyphaser IS-B50LU-C0-ME UHF Female to Male connection 1.5- 400 MHz Also known as Motorola part number RLN4707A.

part #: isb50luc0 price

• $145.00

specifications coaxcabl:

• brand: Polyphaser
• mpn: Is-b50lu-c0-me
• compatible brand: Universal
• type: Grounding
• connector b: Uhf Male
• connector a: Uhf Female
• features: Compact And Lightweight Design

returns coaxcabl:

• policy: No Returns

offer coaxcabl:

• quantity: 2
• best offers: True
• started: March 17, 2026
• availability: In Stock
• sold: 0
• options: Ship-to-home

general coaxcabl:

• condition: New
• Radio Communication > Parts Accessories > Coax Cables Connectors

seller coaxcabl:

• city: Conway, Arkansas
• # reviews: 1773
• rating: 100.0%

payments coaxcabl:

• wallet: Apple-pay
• credit card: Diners-club
• other

shipping coaxcabl:

• transit: 3-8 Days
• carrier: USPS
• service: USPS Ground Advantage
• class: Standard
• cost: $8.10
• type: Calculated

Polyphaser IS-B50LU-C0 Is Similar To:

• 099-0402t Protector Polyphaser Lightning Rotor (24.2% similar) I'll be listing alto of obsolete hard to find items. Yes, I combine shipping. OK then, start buying. I'll be listing a few thousand different assorted types of mil spec components,parts,connectors,processors,ICC's,etc. Read before you bid serious buyers only. Rotor lightning protector. You won't ...(April 7th, 2015)
• 700mhz-2.5ghz Polyphaser Impulse Transient Lightning Protector 7 16 Din M-f (42.1% similar) You are buying on a new, in the box Polyphaser in line emo lightning surge filter model discs bf. Has 7/1 6 din male connector on one side and 7/1 6 din female connector on the other side. Usable frequency range is 700MHZ...(May 5th, 2016)
• Nos Polyphaser Coaxial Lightning Cable 7ghz Dc Gt-nff-al Ohm 50 Protector (41.1% similar) Polyphaser in line emo surge protector. See picture 2 for all the details and manufacturers specifications. New old stock...(April 21st, 2015)
• Al-lsxm-bfn Polyphaser In-line Emp Surge (39.3% similar) Polyphaser al-lax-bf in-line emo surge filter 2GHZ-6GHZ new in box...(December 13th, 2017)
• Bf-adapter Polyphaser Bulkhead-flange Adapter (42.6% similar) Polyphaser - bulkhead-flange adapter. Condition is new. Shipped with USPS first class package...(December 19th, 2017)
• Cgxz-36nmnf-a Dc Brand New Polyphaser Pass Through Protector (36.5% similar) ...(May 17th, 2018)
• Dgxz 06nfnf-a Polyphaser 800-2500mhz Surge (37% similar) New Polyphaser Dix 06NFNF-A surge protector...(January 12th, 2018)
• Dsxl-d-ma-bf Dsxl-d-ma-bfs Polyphaser New Lot Bfs Emp Surge Filter (36.4% similar) Template rounded left bottom. 2:1 vst in-line emo surge filter w flange bracket bull new Polyphaser discs-d-ma-BS 800MHZ-2. Testing cosmetic notes: this is a new item in excellent condition that its original packaging and guaranteed working components included offer: bull Polyphaser discs-d-ma-bf ...(July 18th, 2018)
• Gt-nfm-al Polyphaser Single Gas Tube Surge Protector (49.6% similar) Polyphaser - single gas tube surge protector, NF NM straight gas tube with aluminum body, dc to 7 GHz, n-f on side, n-m protector side. Designed and created with the highest possible quality lightning protection device maintain a high level of rf performance. Non-replaceable elements bulkhead mount ...(June 29th, 2018)
• Ipolyphaser Polyphaser Al-lsxm 2 To 6 Ghz In-line Emp Surge Filters 646444655866 (38.2% similar) Just like there impeccable reputation for sales service the items new or used have been carefully handled and never misused...(December 2nd, 2015)
• Is-b50hn-c0-me Polyphaser Bulkhead Antenna Adapter Surge Protector (53.1% similar) Shipping worldwide using USPS. See calculator for available options. Shipping on this item: is a 'small' item...(August 24th, 2018)